If Confluence and JIRA are hosted on the same server, you need to ensure that at least one of them is running on a different context path, or is configured to use a host header.
Otherwise, the Confluence and JIRA systems may share a JSESSION ID cookie and keep overwriting each others login sessions.
This often problem presents itself with two symptoms:
* Users getting logged out of one system when they log in to the other
* Integration features such as Gadgets do not work
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