i install et new, after a great system crash. Now i have this massage:
You have an invalid guid. This might be a temporary problem and you should try reconnecting. This massage always when i go to my old servers. New server no prob, load the map and play. disconnect from this server and go to the other server come the massege invalid guid.
I hope you can help me. Sorry my english is so bad.
Cu Badguy (alias Coward on uk server):)

Hi badguy.
You should verify in your ETMAIN folder if you have an etkey file.
The best would be to paste into your new ETMAIN a copy of your old etkey if you kept a copy somewhere of your ET files before your crash.
I saved everything on an external disk, it's the best way to prevent problems when reinstalling.

Simply create new empty file etkey.txt in etmain folder and then delete .txt extension. It works in my case.