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Even with session explicitly enabled <%@page session="true"%>, session does not persist. The same exact code works fine on JRun and WebSphere.
This is caused by bug in ICE Browser (Cookies are evidently not enabled so session #s can't be passed). Use external browser instead. Set Tools->JSP->Web Browser and Tools->Options->Web Browsers *** This issue has been marked as a duplicate of 10432 ***
Resolved for 3.4.x or earlier, no new info since then -> closing.