400 Bad Request The request could not be understood by the server due to malformed syntax. 1. The peer cache source client updates the last referenced time of content in the cache when a peer downloads it. If you don’t need to use chronyc remotely, you can add the following directives to the configuration file to bind the command sockets to the loopback interface. by To make an HTTPS call with a client certificate, you can do it this way: 1) Create a file containing both the key and the signed certificate. 168. but,When I Create a ApplicationEndpoint,Exception is throwed :Failed to connect to a peer server =====Exception Info===== The GetInbandDataAsyncResult operation has failed with message: "The data session subscription to server failed. Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services. The spawner failed to find the named spawner definition. When this option is used, each client will “see” the other clients which are currently connected. Suppose you had a PKI consisting of a CA, root certificate, and a number of client certificates. 6. They describe Client Peer Cache as a new built-in solution that allows clients to share content directly from their local cache with other clients. rb. Otherwise, correct the configuration source to define a valid spawner containing the correct Learning WebRTC Peer-to-Peer Communication, Part 1 A web developer explores how to work with the open source WebRTC platform that allows coders to create peer-to-peer communication channels. 0290. Resolve issues as necessary on the DNS Server service, and then resynchronize the client with the time source peer. I have downloaded the certificate from the site and imported it into STRUST (SSL Client Anonymous). Operations. The peer/server is selected for possible synchronization, when 'our_master' fails or the client loses sync. 1008. It’s an open-source project based on Bitcoin Home About Wallet Whitepaper Community Ravencoin is a peer-to-peer blockchain, handling the efficient creation and transfer of assets from one party to another. The client. log file on the client shows 2 yellow errors at different times. Second, in the absence of a NB source binding, check if there is a static host route or static network route that causes the OS to select the unexpected source IP. 1. The reach peer variable is an 8-bit shift register displayed in octal format. Often this error can easily be fixed by a resync of the time. Recover from a failed server in a GlusterFS array. If it is not, then you have to first upgrade to this latest version of the driver and then run Dell SonicWALL GVC again. 051 seconds, 1 problem found Diagnostics If the Amanda server is running version 2. Click more to access the full version on SAP ONE Support launchpad (Login required). However, if the server does not send a list of trusted certification authorities, Internet Explorer displays all the client certificates that are installed on the client computer. Comparing client-server model to the Peer to Peer model, if one server fail, clients’ requests cannot be served but in case of P2P networks, servers are usually distributed among many nodes. The whole point of dyndns-like services is the present a static dns name, whose IP pointer may change occasionally, so pointing to the DNS name should be reasonably reliable. If content is being retrieved from either a systems local BranchCache or a peer systems BranchCache, that counter will show activity. This is opposite to what happens in the TCP protocol. When a valid packet is received, the rightmost Starting from version 2. To resolve this issue, set the Remote Registry Service on the client to either Manual or Automatic. The VPN Client may have nothing to send to the peer, but DPD is still sent if the peer is idle. The code used is C language with detailed steps and sample console output tested on Linux OS The Linux socket stream client-server C program example compiled using GCC what does the client logs says ? do you see anything wrong in wuahalnder. When a node starts and detects it doesn't have a previously initialised database, it will check if there's a peer discovery mechanism configured. net. The –client-to-clientflag tells OpenVPN to internally route client-to-client traffic rather than pushing all client-originating traffic to the TUN/TAP interface. The ccmsetup. The following list describes items to check if your application fails during software distribution. It is basically a way for the client to flag that this peer is unreliable and it is better to request pieces from other clients. 1) Turn on client-side logging (Tools/Options/General: “Turn on logging in Lync”) 2) EXIT Lync completely (not just logout) 3) Navigate to C:\users\ \tracing\ and delete (or rename) the file *. The service must accept an incoming connection, and when it does, it too receives a channel. To access the OpenBazaar marketplace on your mobile device, check out Haven. In essence, ports are used to look up services and then communication occurs over a pair of connected channels (i. Learn vocabulary, terms, and more with flashcards, games, and other study tools. sk21636 – cisco side not configured for compression No response from peer. However, the last four polls worked fine. A CRL (certificate revocation list) is used when a particular key is compromised but when the overall PKI is still intact. One drawback to the peer-review process is that articles may not appear for one or two years after they are written. The calling client will establish a media session directly with the A/V Edge Server as will the receiving client. Syncthing is a continuous file synchronization program. Search for additional results I\'m trying to retrieve data from an open data api. Configure a subnet side rule to identify traffic that should be treated as LAN-side traffic. When upgrading the vSphere environment from a version that allows duplicate names, the vCenter Server Appliance pre-upgrade check fails with the following error: Source vCenter Server has duplicate names in a network folder. This scenario is trying to describe the situation where the problem is that the Check Point admin added a route to the Cisco peer and/or to the Cisco Peer's VPN domain and for next hop he did #2 above, when he should have done #1 and specified his Internet router's IP as the next hop gateway for the route. Peer PXE – The Basics. The Remote Registry Service is disabled on the client computer. 1 box, but my windows 10 box is giving me some ssues. When a client connects to a port, the client receives a channel for interacting with a service. pem private key for all future authentication requests to the Chef Infra Server. If we have a tunnel from our Check Point gateway (GWA) to a non-check point gateway (GWB) we cannot use permanent tunnels. 0, the NTP server port is open only when client access is allowed by the allow directive or command, an NTP peer is configured, or the broadcast directive is used. conf # Allow NTP client access from local network. 1039 Failed to complete TLS negotiation with a peer server Use the information listed here to help you solve problems with your TLS/SSL system. A2200218 An anonymous peer is not accepted. 10 for the disk queue is a very low value the only way to change this threshold seem to be with WMI on the client. ConfigMgr Client Health is a PowerShell script that increased our patch compliance from 85% to 99%. pem format). It was very helpful. Incoming packets are represented by small lines moving from right to left. Client for Microsoft Networks is an essential networking software component for the Microsoft Windows family of operating systems. Thanks everyone now client has been installed on windows 10 machine but I am unable to install sccm client on windows 7 machine. All communication between client and server is done over HTTP with data compression and binary deltas to provide the best in remote access. remote the hostname or IP of the remote machine. As discussed in the previous Network Time Protocol (NTP) concepts article, the configuration of NTP is not overly complex. Clients sometimes handle processing, but require server data resources for completion. allow 192. The client transmits its certificate to the remote peer (Configure logging as shown on the HelpRequests page and search for "cert" without ") The remote peer trusts the root CA that issued the client's certificate or the client's certificate is locally available and loaded (check with ipsec listcerts or swanctl --list-certs) When starting the client install from the console (Right click -> Install Client) the ccmsetup. 0. During a normal startup the registers values are these: 0, 1, 3, 7, 17, 37, 77, 177, 377. The first thing that happens is that the client sends a ClientHello message using the TLS protocol version he supports, a random number and a list of suggested cipher suites and compression methods. The first thing that needs to be determined is the method of NTP operation that best fits the requirements for the target network; once this decision has been made, the steps shown in this article can be used to implement NTP and get the target device’s clock time Earlier releases of vSphere allowed a Distributed Virtual Switch and a Distributed Virtual Portgroup to have the same name. Viorel Tabara is a Guest Writer for Severalnines. It is very incomplete and one-sided at the moment, and basically restates what was presented at the May 17 Global meeting . There are so many reasons for migrating your environment to ConfigMgr CB (current branch), one of them being the new content management feature – Win PE Peer caching. The following is what you see when you run the client and the server using the java VM parameter: -Djavax. Peers are equally privileged, equipotent participants in the application. During the initial Chef Infra Client run, Chef Infra Client registers itself with the Chef Infra Server using the private key assigned to the chef-validator, after which Chef Infra Client will obtain a client. The client-server model differs from a peer-to-peer (P2P) model where communicating systems are the client or server, each with equal status and responsibilities. Click Main Menu, and then click the Setting icon (). Check the Troubleshooting logs for the device within the Workspace ONE UEM Console under Devices > List View > [Select target Device] > More > Troubleshooting. So why it is down could be as simple as no traffic has been sent into the tunnel. Otherwise, each client will only see the server. This page demonstrates the steps on how to build the Linux socket stream client-server applications. This sends the client team scurrying to their server and staring at their certificate. Some errors (like file not found), the client will immediately fail over. - Clients running corresponding SCCM client v5. Just giving some perspective on how it gets enabled. The stated goal of the project is to provide secure yet easily accessible communication for everyone. Resolution: If a spawner name was specified at invocation, ensure the name is correct. The server relays process output to the client. A peer object encapsulates the properties of an endorsing peer and the interactions with it via the grpc service API. I'm trying to connect to a Cisco VPN using Cisco VPN Client 5. TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity) TLS Error: TLS handshake failed SIGUSR1[soft,tls-error] received, client-instance restarting; Here is my server config (this is on my windows 8 computer) port 1194 proto udp dev tun ca "C:\\Program Files\\OpenVPN\\config\\ca. Client peer cache helps you manage deployment of content to clients in remote locations. I won’t go into the details of why we chose gRPC as the main communication protocol… We’ve seen 3 different methods of authenticating a gRPC client with a gRPC server. Unable to connect to P4 server from P4V - posted in P4V: My apologies if this is not the correct forum. This issue could arise if the User is behind a Firewall or if the TCP port that the VPN client is blocked. " Video tutorial If the client continues sending data to the server after the close, the server's TCP stack will send a reset packet to the client, which may erase the client's unacknowledged input buffers before they can be read and interpreted by the HTTP application. Finally, it will attempt to join the cluster of the first reachable peer. check encryption domains. His passion for PostgreSQL started when `postmaster` was at version 7. Also new in 1606 is the ability to configure the BranchCache client settings via the ConfigMgr client settings. NtpClient was unable to set a domain peer to use as a time source because of discovery error. 173 4-1 request failed at peer, 1 The information above is all well and good if your client is on Windows 7, but as i have just found out, if the client is on XP, the BITSAdmin. If that's the case, it will then perform the discovery and attempt to contact each discovered peer in order. To enable peer cache, deploy the client settings to a collection. I´m not able to configure the EAP-TLS autentication. While the DataPower admin is technically correct that a certificate never arrived, it is more likely that the handshake failed long before the point where certificate presentation occurs. If the Server does not supports any such Cipher algorithm which is common to Client then the communication will not happen. Suppose I want to allow a user who is not runningthe chat client to send messages? I am trying to set up a service that can call into the peer channel as if it were an actual client. See the InnerException and FailureReason properties as well as the logs for additional information. Packages failing for clients in other domain (download failed - content mismatch) - SCCM 2012 R2 I have my server set up with SCCM 2012 R2 (Server 2012 R2) and client systems (Windows 7 Enterprise SP1 x86) in a separate domain (the client domain trusts the server's domain). 00. 33 Check Point resolves port filtering issues with Visitor Mode (formally: TCP Tunneling). -2016407547,2278559749,0x87D01005,The policy for this program does not exist or is invalid. At NetWorker server command line, go to the location /nsr If Load Sharing or Service Based Link Selection is enabled on the local Security Gateway, but the peer is a non-Check Point device, the local Security Gateway will only use one link to the non-Check Point device: the best match (highest prefix length) link with the lowest metric. i Table of Contents INTRODUCTION 1 PEER REVIEW ENROLLMENT REQUIREMENTS 2 What is the AICPA’s practice monitoring requirement? 2 Does my firm have to enroll in a peer review program if it does not have an accounting and FAQ on SAP HANA Network or Interview Questions and Answers for Experienced such as What is the meaning of network in the context of this SAP mean, Which indications exist for SAP HANA network problems, What types of networks exist in SAP HANA environments and so on. I. Or, if no name was given, a spawner definition that referenced the host in which the spawner is executing. Give the server the peer UUID of the failed server. To resynchronize the client with time source peer: blank: source discarded, failed sanity See the Select field of the Peer status word on the NTP Event Messages and Status Words page for more information on the tally codes. As a work around, I would suggest you to disable the Windows Firewall and check if it makes a difference. Reconfigure the peer servers. You can help protect yourself from scammers by verifying that the contact is a Microsoft Agent or Microsoft Employee and that the phone number is an official Microsoft global customer service number. You've been warned. Here is an example of how the sample entries looks like. If the Mode is set to Static, click the button next to Dynamic Host Configuration Protocol (DHCP). -2016407546,2278559750,0x87D01006,The requested program is not currently pending. conf # Use Peer peer 192. What's the difference between client/server and peer-to-peer networks? In terms of security and cost, quite a lot. For more information see: Office Mode. Peer cache was newly introduced concept from ConfigMgr where the client can get the content from its peers (need not be in the same subnet like in branch cache). The most popular one is the net graph, which can be enabled with net_graph 2 (or +graph ). The frequency of the check and remediation settings are based on how you configure the Host Integrity policy. When two peers use IKE to establish IPsec security associations, each peer sends its ISAKMP identity to the remote peer. To set this registry entry, follow these steps: Click Start, click Run, type regedit, and then click OK. You might experience connection problems between Horizon Client and a security server or View Connection Server host when the PCoIP Secure Gateway is configured to authenticate external users that communicate over PCoIP. sane Sanity tests are used in order to test the NTP packet received from a server. The local FortiGate unit and the VPN peer or client must have the same NAT traversal setting (both selected or both cleared) to connect reliably. e. It synchronizes files between two or more computers and replaces proprietary sync and cloud services with something open, trustworthy and decentralized. It detects and fixes known errors in Windows and the Configuration Manager Client, and enforces required services to run and start as Automatic. Peer cache. If the Remote Registry Service on the client has stopped and the service disabled, Endpoint Protection Manager cannot scan the registry because the service is not running. If you’re looking for a complete SCCM installation guide, see our blog series which covers it all. I transpose the source code, you transpose the After using Perfmon on the source client, I confirm that the download fails when the disk queue exceeds 10. I have inherited the role of Perforce admin for my team. Brien Posey discusses these differences and offers advice on picking a networking Client check: 1 host checked in 30. The inbound media stream relayed by the Edge Server will be accepted by the called client’s firewall. I am your typical newbie. In our test case and on the second system, no content for this advertisement has ever been downloaded before so we expect content to be retrieved from our peer client that is BranchCache enabled. Check if you are using the latest driver for each Network Adapter card installed on your computer. exe runs on the client but never actually finishes. Check Point VPN Debugging Guide. Other connectivity issues can arise, for example when a remote client receives an IP address that matches an IP on the internal network. If you didn't check off the "peer-reviewed articles only" box, try to see if your results can organized by source. -2016407544,2278559752,0x87D01008,Failed to indicate the client cache is currently in use. Just to give you a brief idea: the Cipher is initialized by the Client end and Sever has to choose any one of the Ciphers presented by the Client to communicate on SSL. So down to business. Trend Micro firewall: If you have installed this client based firewall, then check to make sure it is the latest If the corresponding time source sent a valid response, the rightmost bit is set. The client uses this timestamp when it automatically maintains its cache, removing older content first. My personal preference is to use TLS client certificate authentication when possible, but this requires quite a bit of external setup. Maniar Dhruvin gave a fair explanation already but here's a couple old nice '90s diagrams to illustrate it -- the basic principles are very simple: In Client-Server all communications is via a central server to which all clients connect. 0/24 – copy the key file to the clients – open up ntp service port firewall-cmd. Administrators should check the diagnostic header sent with this code for more information about the ‘Source’, ‘Peer’, ‘Port’ and other failure details, if available. External Peer-to-Peer Scenario. Tox is a peer-to-peer instant-messaging and video-calling protocol that offers end-to-end encryption. Retrying in 30 minutes. On clients you must specify the following and disable “server” in /etc/chrony. OpenBazaar is an open source application for Windows, Mac and many Linux desktops. Client-Server The following table presents a brief comparison of the relative benefits and drawbacks of peer-to-peer (P2P) networks versus client server networks. He is a system administrator with many years of experience in a variety of environments and technologies. ". Locate and then click the following registry subkey: Right-click on the Live View to access the Quick Menu. The Source engine offers a couple of tools to check your client connection speed and quality. Start studying Networking & Internet, TCP/IP protocols, PROTOCOLS, Client Server, Client-server and peer-to-peer networks, Encryption, Wireless Networking. Clients will try for about 10-15 minutes or so to contact a Peer Source, and then fail to the next. there may be some drop in service when the ip changes and the router has not yet completed the update to the service provider however, which may require you to reconnect the tunnel. 07. Ensure that there are no typographical errors or name resolution errors. Solved: I've gotten Cisco VPN Client to work on my windows 8. Peer cache is a built-in Configuration Manager solution that enables clients to share content with other clients directly from their local cache. Peer objects are used by the Client objects to send channel-agnostic requests such as installing chaincode, querying peers for installed chaincodes, etc. On Microsoft Windows machines, the default location for this file is C:\chef\client. Then I created a HTTP connection to external server in SM59. By continuing to use this site, you are consenting to our use of cookies. 2. Very cool. It’s a Pre-Release feature so first enable it from Updates and Servicing. Please follow the steps given below to delete the NSR peer information on NetWorker Server and on the Client. Thus, a user without the Win Forms chat client could call a WCF service which would send the message to the chat Peer-reviewed articles lead to many articles in a chain of information. It extends the functionality to the full ConfigMgr client as opposed to just Win PE. uccapilog 4) Launch Lync 5) Repeat your failed test scenario 6) Exit Lync 7) Browse the now much smaller and useful log file (Notepad++ is good, or This post is a technical presentation on how we use gRPC (and Protobuf) to build a robust client/server system. rb file specifies how Chef Infra Client is configured on a node and has the following characteristics: This file is loaded every time the chef-client executable is run. refid the identification of the time source to which the remote machines is synced. Now, in ConfigMgr Technical Preview 1712, there is a new feature: Peer PXE, that doesn't require that you configure the client as a distribution point. The client has With this the client sends SIP service request to Front End which includes the client’s location (internal or external). To me it’s important to understand what the feature is bringing to the table, and what it is not. Select the check box if a NAT device exists between the local FortiGate unit and the VPN peer or client. Delete the NSR Peer Information of the NetWorker Server on the client/storage node. A client requests specified data or processes. For more information, see Delivery Optimization In-Network Cache in Configuration Manager. Check your SNC configuration. Peer-to-peer (P2P) computing or networking is a distributed application architecture that partitions tasks or workloads between peers. See Creating a Quarantine policy for a failed Host Integrity check. Check your Mode settings. If the IPsec VPN tunnel has failed within the IKE negotiation, the failure can be due to either the PIX or the inability of its peer to recognize the identity of its peer. domain' didn't return DP locations for client package with the expected version. Check the cabling if it is really the client-side SteelHead. BW source system connection works with the logical system name and therefore a logical system name for the appropriate client is mandatory (BW and source system) 2. , connection instances on a port). . Peer Cache in 1606 is an extension of the WinPE Peer Cache functionality that exists in Current Branch today. I did this by concatenating my (. Vault was designed to ensure the integrity of data by committing source code changes in atomic operations to a SQL Server database. For example, the database Criminal Justice Abstracts will let you choose the tab "Peer-Reviewed Journals. pem) key and the certificate I've got signed from my CA (also . This means that the tunnel will be down, and not appear in this list until traffic is sent in it. Click Apply to save settings and click OK to exit. Because the Edge is not on the domain it can’t authenticate client directly, so the Front End server requests the credentials on behalf of the client. log,windowsupdate. When a peer agrees to send you a piece you have requested and then does not send that piece within a certain time your client will snub this peer. exe for XP offers very little information, even with the verbose switch, as to what the problem is. This post is a complete step-by-step SCCM 1610 upgrade guide. Other Connectivity Issues. on Windows 10. conf file on the client side. They are said to form a peer-to-peer network of nodes. Please also note that when I push client from sccm console then it does not update ccmsetup. \UsbIp>usbip -a 192. About this page This is a preview of a SAP Knowledge Base Article. Even if one or more nodes fail, for example if a node failed to download a file the remaining nodes should still have the data needed to complete the In such an environment, if a client cannot obtain a connection from one data source in the multi data source because the data source doesn't exist or because database connectivity from the data source is down, WebLogic Server will attempt to obtain a connection from the next data source in the list of data sources. A Windows computer must run Client for Microsoft Networks to remotely access files, printers, and other shared network resources on a Windows server. For multiple Peer Sources, a client cannot be forced to go to a specific Peer. Failed to connect client peer, please check the configuration and peer status. The server has successfully synchronized to its sources if the leap peer variable has value other than 3 (11b) The client has successfully synchronized to the server when the leap system variable has value other than 3. It seems that this version of Cisco VPN Client uses different DPD algorithm, which is similar to ASA "semi-periodic" DPD. Check if the BW has a connection to the SAP sourcesystem and vice versa table RSBASIDOC‘ => Field SLOGSYS contains the logical system name of the source system and field RLOGSYS Problem. debug=ssl:handshake. ISE Problem: EAP-TLS failed SSL/TLS handshake because of an unknown CA in the client certificates chain Hello, I´m stucked with this problem for 3 weeks now. The third upgrade for SCCM Current Branch is now available. MP 'server. Additionally, you can force IPsec to use NAT traversal. Then delete the NSR Peer Information for the client/storage node from the NetWorker Server. After a number of tries to connect to a peer, it uses the DP as last resort and successfully downloads the data (but not from a peer cache source). On the new server, check To synchronize the time of your local Linux client machine with NTP server, edit the /etc/ntp. The verification of the peer certificate failed on the server side. In the following example, you are specifying multiple servers to act as time server, which is helpful when one of the timeservers fails. You’ve set up federation between 2 Lync Server 2013 environments but notice that only 1 of the company can see presence information and have the ability to send messages while the other company is unable to see presence information from the other company, unable to send messages but is able to receive messages. While the client is in the Quarantine location, the Host Integrity check continues to run and to try to remediate. The larger the number, the longer it takes for the peer to recover IP addresses after moving to the PARTNER-DOWN state. The main difference between the Client-Server and Peer-to-Peer network model is that in Client-Server model, the data management is centralised whereas, in Peer-to-Peer each user has its own data and applications. if there are no patches needed by the client ,then you are good else try to deploy any of the client On the search screen, look for a check-box that allows you to limit your results to peer-reviewed only. . As previously mentioned, the new Peer PXE feature in ConfigMgr Technical Preview 1712 is not connected to the distribution point role. Perform the following procedure on the computer that is logging the event to be resolved. Ask Question Asked 12 months ago. ConfigMgr 1702: The case of unexplained – Client Peer cache not getting disabled even after disabling it via Client Settings. the VPN Client sends its R-U-THERE message to a peer if the peer was idle for approximately ten seconds. Click Network > TCP/IP. Check out my Certify library to make that kind of thing easier. On all other systems the default location for this file is /etc/chef/client. 4. With SCCM 1610, Microsoft has released a new peer caching technology designated as “pre-release” that they refer to as Client Peer Cache. log unless I run it manually with below logs: Peer-to-Peer vs. For this reason they are not the best sources to seek for hot, news-driven topics. 8692. A client that is operating as a peer content source sends a list of content it has cached to the ConfigMgr Site via its Management Point via state messages – so every time a Peer Cache source adds (or removes) content to the CCMCACHE it gets reported back to the site DB. Check peer certificate against the file crl in PEM format. Because VSP is enabled by default on a SteelHead EX, and the default subnet side rule assumes that all traffic is coming from the WAN, client-side connections are not being optimized. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. log about software update scan ? if the scan is doing correctly ,go back to your SCCM server ,look for the client ,what patches is it requesting. If it fails then the udp protocol is not concerned. on master you must add the following into /etc/chrony. Thus 257 in the dual system is 10101111, saying that two valid responses were not received during the last eight polls. I have one question, though. Routing issues of this sort are resolved using Office mode. In the event that STUN fails then the final option is to utilize the Edge Server as a media relay. In simple terms when using the udp protocol, the client throws a packet at the server and its upto the server whether it catches it or not. 1 or higher, you can use amservice(8) to diagnose network problems, independent of any server configuration. We are trying to utilize Peer Caching but are unsuccessful in getting it to work. Then members of that collection act as a peer cache source for other clients in the same boundary group. With the limited information, it is probable that it can't find content somewhere it should be, so that would be my starting point, check content status for the applications in your task sequence, check boundaries, redistribute for good measure, etc. A client that operates as a peer content source submits a list of available cached content to its management point. For Peer configurations. Max Client Lead Time (s): Specifies the length of time that a failover peer can renew a lease without contacting its peer. strongSwan is an Open Source IPsec-based VPN solution for Linux and other UNIX based operating systems implementing both the IKEv1 and IKEv2 key exchange protocols. So it should wait to remove content that peer cache clients more frequently download, if at all. Host-resident Firewalls Typically, any conflicting firewalls are located within the network cloud. Failed to match proposal. crt" USBIP Windows Client The most recent version is present as source code in the SVN repositry. Start studying Peer to peer and Client server networks