502 Bad Gateway

I have the following set up for Subversion 1.3.2 (r19776) on Ubuntu
Linux 6.06:
Internet -------> Apache/HTTPS/vhost[1] ---mod_proxy--->
Apache/HTTP/vhost/mod_dav_svn[2]

When I make a request to the machine [1] where I have done a svn copy, I
receive a response 502 Bad Gateway. When I make the same request to
machine [2] it succeeds. Googling around reveals a bunch of explanations
- all specific to my particular set up, but none are very useful at
describing the "actual" problem. Some say it is mod_proxy, others say it
is the certificate (domain name mismatch?), but I cannot be sure and I'm
hesitant to start guessing for fear of The Red Herring.

The reason I'd like to know the problem is so that I can devise a
solution and/or workaround. Some say to use HTTP instead of using HTTPS
(which is unacceptable for me). I can't even do server-side copies as a
workaround. Can anyone provide something specific that would easily
assist me in finding a suitable problem to this problem?

-- 
Tony Morris
http://tmorris.net/
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