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When I look at the request in the HTTP monitor, there is no session cookie, even though the session cookie is present in the cookie header, and the server clearly finds the correct session. This is because of an error in Tomcat - the coyote connector was erroneously modified to discard the session cookie as far as the Servlet API getCookies method was concerned. The error has been corrected (on or near March 19), but it's present in Tomcat 5.0.19 which is the server bundled with NB 3.6. So there is no error in the monitor (it reports the "real" data from the servlet APIs) nor in the tomcat integration, but I record the error for tracking purposes. Close the bug when we upgrade to a new version of Tomcat.
Closing as WONTFIX. New version of Tomcat (6.0) is bundled with NB now...