You can't log into chess.com with Arena, WinBoard, Scid vs. PC, Babaschess, etc. It's not possible. Chess.com isn't set up that way - it doesn't use the same protocols.
How do I log into chess.com with Arena GUI?
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Thanks, that explains why I couldn't get it working.
With Arena GUI I can log into many chess servers but I've tried to get on to chess.com a few times without successes.
Anyone know if it's possible to use a client ui instead of a browser?