I am no PHP expert, but I seem to recall that session_start() sets a
cookie. Do you see this cookie (and the X-sess header) in the browser?
How about between Pound and the back-ends?
--
Robert Segall
Apsis GmbH
Postfach, Uetikon am See, CH-8707
Tel: +41-44-920 4904
 
You are correct that session_start() set's a cookie,
The reason I have opted for header is in case the user has cookies disabled.
 
The header and cookie is being seen by the web browser as LiveHTTPHeaders shows:
 
HTTP/1.x 200 OK
Date: Mon, 30 Apr 2007 10:54:00 GMT
Server: Apache/1.3.37 (Unix) PHP/5.2.1
X-Powered-By: PHP/5.2.1
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
X-sess: 211ccb1d6235d98a9c40ae659c8ea4ee
 

 
Thanks
 
Rachel