====== Troubleshooting T3C Server connection issues ====== If //T3C system// was working fine and from some time point it is not working anymore, please verify what changes has been made in network and infrastructure configuration and //Internet// connection in your institution. Often it happens, that after weekend the connection with //T3C Server// is not working due some local infrastructure maintenance. ===== Assumption ===== * //T3C Service// and //T3C Console// is running * //T3C Console// connection indication in the right section of the status bar shows {{:wiki:connection-noserver.png?15}} icon ===== Possible causes and solutions ===== * //Internet// connection problem or addresses translation * //T3C Server// has a short-term outage or is overloaded * //T3C Service// connects to the Internet using a proxy server that is not currently operational or its settings or authorization has changed * Communication is blocked by a //Firewall// ==== Internet connection ==== Open an internet browser and try to access multiple sites on the //Internet//. If you have any problems, please contact your ISP or network administrator. ==== Availability of T3C Server ==== Verify the availability of //T3C Server// at https://cs.t3c.sk: * The page with the T3C logo in the green circle appears, the connection is OK * The page with the T3C logo in the orange circle appears, the server may be temporarily overloaded * The page with the T3C logo in the red circle appears or there is no page: * Address translation error: * In command line run //nslookup// * Enter address cs.t3c.sk * Verify that it translates to 52.232.111.202 * The server is blocked - try accessing from another network or other device * The server has an outage or the connection is currently overloaded - try it later ==== Proxy server ==== If //T3C Server// is available, but //T3C Service// does not communicate, this may be a problem with proxy servers. Please verify your network settings. See also [[guideserverconnectionproxy|the proxy server setup procedure]]. ==== Firewall ==== If //T3C Server// is available, but //T3C Service// does not communicate, network communications may be blocked by a //Firewall//. Try to temporarily disable the //Firewall// and verify connection - in //T3C Console// menu select //View/Update from the T3C Server//. ~~DISCUSSION:off~~