Faulty network wiring or connectors can cause problems that are difficult to isolate.
Try re-creating problems on a similar machine with the same configuration. If a problem occurs on only one machine, it may indicate a wiring or hardware problem.
For information on detecting wiring problems under NetWare, see your Novell NetWare manuals. The Novell LANalyzer program is useful for diagnosing wiring problems with Ethernet or TokenRing networks. Your NetWare authorized reseller can also supply you with the name of a Certified NetWare Engineer who can help diagnose and solve wiring problems.