I wrote a mail to the server-provider but either they can not or they are not willing to help me.
Thats why i rent a new server from a different provider. There runs everything fine with 100% same configuration. I activate the redirect-function in nexgen and set MaxPlayers=0. So every player who connects to the old server will be automaticly redirected to the new one. Or is there another, smoother method of redirecting players (including someone which come as spec) ?
Thank you all again for your help
. The problem is not solved but eluded. So we dont need to bother with it anymore