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Never heard of this sort of error ... looks like a technical problem rather than a software issue.

But I'm not sure of your case : did you start a machine as a server before attempting to log on to the game ? Can you play on the host machine but not log on from another ? Does a ping to the host from the client work (ie can the client reach the host) ?

Anyway you could try one thing : start a game as server and try to log on to it from the *same* machine (launch a second occurence of Dom2 and type your own IP). Does this work ?