One of our user reported the following:

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I discovered the reason why JIRA sometimes closes my IE session, it depends on the way you login:
1) When you login via navigation to your home page (http://support/jira/secure/Dashboard.jspa ) all is ok, multiple JIRA sessions never expire.
2) When you login via starting up your browser and you click a favorite that is a shortcut to for example your private queries page, you get a message you are not logged in. When you then use the small login link on top of the page, 2 things can happen:
A) an infinite browser refresh of the home page, you need to kill your browser and pray again.
B) you are transferred to the home page ( http://support/jira/secure/Dashboard.jspa?os_destination=%2Fsecure%2FIssueNavigator.jspa%3Fmode%3Dhide%26requestId%3D10447) and you login there, but somehow now a session time out is used so if you have opened after that a second browser window on JIRA, one (or all) of the sessions is closed when unattended for some time.

Note this login timeout issue applies to IE6 and the firefox browser. (however, infinite refresh only seen on IE)