Custom server error page crash

Hey all!

I've recently added a custom server error message using a redirect in 
AOLserver's config file.  Since then, I've been occasionally seeing the 
following error in the logs:

[09/Jul/2008:18:04:08][30505.1690512][-conn:1-] Error: return: failed to 
redirect 'PROPFIND /500.html': exceeded recursion limit of 3

There will be several thousand of those entries in a row, followed by a 
server crash.  I don't see anything in the logs to indicate what may 
have initiated the error in the first place.  And the entries continue 
even after the server reboots.

At first, I thought there might be an error in the server error page 
itself, so I switched it from being a dynamically generated page to 
being a static HTML file, which goes through no filtering, but that 
didn't solve the problem.

Does anyone have any thoughts on what might be going on?

Thanks!

-Scott