NW6 sp3, BM3.7 sp 2

the following error keeps showing up on this server. Any
ideas? and how to fix?

The system is short on event control blocks and network I/O
may degrade or fail
Time : 11-20-2003 9:26:00 am
Server : PROXY
Service : Netware Operating System

Tim R Hautzinger
Information Systems Manager
Elk Island Catholic School District
160 Festival Way
Sherwood Park, Alberta