Hello Hippi,
at first, thank you very much for help.
The Epochversion is 1.0.6.1. i ve checked the Arma 2 and Arma 2 OA Data for Errors and Steam has downloaded and installed 31 new files for Arma and 2 for Arma 2 OA.
But the error is still the same.
I have tried to join other Servers, and can only join this one: 37.61.218.146:2302 Spielwiese - really strange. Although i have reinstalled it all 2 times, i think that it must be done again...
vantgrib