Hallo Daechsle,
NFS Client Port Range
Technote

The NFS client can only use 'Privileged' ports as a source port when attempting a mount. These are ports from 562 - 1000. If there are no available ports or there are port restrictions on all of these ports, the mount will fail with message CPDA1B9 RC - 24 and message CPFA0E2.