[imp] Accessing IMP/Horde behind a load-balanced proxy?

[Brent]

It looks like I have a user who is behind a giant corporate proxy  
server and their ip address will ping-pong between the two outbound  
proxy servers.  Horde complains if it sees your ip address change and  
then requires a re-auth.  I can't prove it yet, but I suspect this is  
what is happening.

Any way to make that more lenient and just use the session cookie or  
something?

This manifests itself as timeouts for the end user as some calls come  
from one address and some calls come from another.

Hmmm...