[Zope] Zope hangs from time to time

[george.lively@ccpace.com]

I have Zope 2.2.2 on Windows NT with ProxyPass to a Linux box where 
the Apache web server is.  We use the Zope Connector to connect to 
Interbase DB also sitting on NT.  From time to time (a few times a 
day), Zope hangs.  It doesn't die, but it will hang for a few minutes 
at which time no one can connect to the site.  Then after about 5-10 
minutes, it will restore itself, and everything will be ok.  If we try 
to connect directly to the Apache web server (running off 8080), we 
connect to Apache very quickly.  When we look at the NT box during 
this time of trouble, mem usage and cpu time look normal.

But here's a twist that perhaps is interesting, perhaps not.  Could be 
a coincidence.  But anyhow, we have been running IPCheck for a little 
over a week - having that little application hit our server every 60 
seconds to see if it's still responding.  When the server does not 
respond, a little alarm goes off.  The log from ipcheck shows that 
some of the non-responsive times are at times when no one is hitting 
the server (except IPCheck).  When I've been around to catch the alarm 
recently, I've immediately logged into /manage on Zope.  Each time 
I've done this, Zope stops hanging.  And it stops hanging 
immediately. Any thoughts?  Is there anything I can do to ensure that 
I don't have to log into /manage to stop the hanging?

Thanks.