An essential clue in trouble shooting are log files. Our Communardo Support asks in some cases for the Jira log.
If you have not changed the destination of the log files in your Jira, you find your log at your JIRA server:
<Jira Home Directory>/log/atlassian-jira.log
If you don't know where your JIRA Home Directory are located, you can look it up in your JIRA Administration -> System Information. There you can find an entry called "Location of JIRA Local Home".
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