Long Query String results in Invalid response

["Sears, Shawn" <ssears@xxxxxxxx>]

I am running 2.5.STABLE12.  When my user's do searches on a couple of
websites that have long Query Strings, they receive "Invalid Response".
If you truncate the query string the query works just fine. If you do
the same query, without using the proxy, they work just fine. 

I have also placed this website in the no_cache group, so we are not
caching any information for this website.

Any help I can get would greatly be appreciated.

Thanks in advance.

Shawn