What does exception 4001 mean?

I was looking for more details on exception code C4001.Can someone send this info please? thank you!Here's the exception I received: java.lang.Exception: javax.jms.JMSException: [C4001]: Write packet failed. -caught java.io.IOException
[285 byte] By [christenscreen] at [2007-11-25 8:08:03]
# 1

The C4001 exception indicates a communication failure

between the iMQ broker and the iMQ client runtime.

There is a known bug in iMQ 2.0 broker that can cause

this type of exception on the client side. This bug

has already been fixed in the iMQ 2.0 SP1 (service

pack 1) release. It is available at -

http://www.iplanet.com/downloads/patches/5059.html

christenscreen at 2007-7-1 13:59:36 > top of Java-index,Application & Integration Servers,Sun Java System Message Queue...