Bernd,
the ncpfs package (containing the ncpmount) is a very old one and was reported a few times having problems on different things.
Are your systems pure SLES 10 SP2 or do they have
OES components installed ?
We run a couple of developer installations (pure SLES 10 SP2) running the Novell Client for Linux. It is officially supported only on SLED 10 SP2, but it works without any problems.
NOVELL: Downloads - Novell Client 2.0 SP1 for SUSE Linux Enterprise Desktop 10 SP2 eMedia Kit
What is the reason that you have filesystems from the Netware box mounted on the linux box ?
Rainer