this is still a problem with NW6.5SP5 and SP3.8 SP4 or SP5.
I think the problem is rather the TCP/IP stack, then the timesync
mudule. And this
occurs only if I try to use VPN. So there must be a combination
between TCP and
Its very sad that nobody at Novell can help on this issue.

Perhaps sombady has a solution for this Problem

Thanks @all.