If you have applied NW65SP4 you MUST apply this patch as soon as

Attached is N65NSS4A.EXE.

This is the updated NSS patch kit for NetWare 6.5 SP4.

The main reason for this release is the problem that we found (and
fixed) in NSS where a rebuild could lead to data loss. We are
currently writing a TID with a better explanation and how to get out of
this issue if you find yourself in the middle of it.

There are other fixes in this set of files for NSS, CIFS, and AFP.
Please review the readme file (also attached) to see these issues.