[Zope] Erratic HTTP 500

[sean.upton@uniontrib.com]

I have an automated process that uses cron and wget to hit a method in Zope
daily.

Normally in wget, I first get a 401, which prompts wget to send basic auth,
which it sends upon resending the request with the right user/pw in headers,
and then gets a 200 (success) after a 15 to 20 minutes (it's a big, slow
process).  Lately, though, I have been getting an HTTP 500 almost
instantaneously on occasion, and the logs seem to verify this.  Retrying the
process usually solves this problem, but I am trying to figure out why the
500 error is occurring.  

I am running Zope 2.3.2 with ZEO (1.0b3 + modifications from CVS earlier
this summer), and one of my 2 ZEO clients is having this problem and not the
other.  I have squid in front of this setup for Virtual host support and
Squid load-balances the 2 ZEO clients, and the requests, when sent to one of
my ZEO clients works fine, but seems to fail every time.  The box that seems
to be having the problem seems to work fine in other respects.

Anybody have any thoughts on what problems might trigger an HTTP 500 in
Zope?

Sean

=========================
Sean Upton
Senior Programmer/Analyst
SignOnSanDiego.com
The San Diego Union-Tribune
619.718.5241
sean.upton@uniontrib.com
=========================