BM3.7SP2 / NW6SP3 w/ 500MB RAM

Our BM server became suddenly slow today. When I checked the current
activity for the BM fast cache 533 connections were open. 243 on the
client
side and 292 on the server side. And the numbers were slowly growing.
On
average I only have about 40-50 client side connections at one time.
Utilization was at 100% as well. I went to run monitor on the server
but it
just hung so I couldn't check the traffic on the NIC's nor could I get
in
thru remote manager to check things out. BM alerted me with this
error...
"The system is short on event control blocks and network I/O may
degrade or
fail". I just bounced the server and everything is ok for now. I
checked for
abends...none and nothing of concern in the sys$log.err. The remote
manager
health was showing the server processes being low though.
I started thinking memory, but it looks like the open connections are
not
being torn down.
Any ideas?

Rich