Can't connect to server I've been on

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Take a look at this tread, there more simlar around.

Can't Connect to any server, can only play single player

Over time, your system will automatically cache IP addresses and other DNS results, in order to speed up subsequent requests it makes to the same hostname. This is all good, but at times, bad results will also be cached and therefore require to be cleared from your cache in order to communicate with hosts correctly. Similar to this, your TCP/IP settings may get corrupted, and will need to be reset. To perform this procedure, follow the steps found below. From Windows Start , search for cmd . …