Do you happen to have proxy configured? Some similar problem can be seen with Nginx with a particular version as you can see in https://confluence.atlassian.com/display/JIRAKB/Communication+Breakdown+error+on+issue+comment+due+to+Nginx+proxy
Hi, we are on a company intranet, using a system proxy.
Most navigation in JIRA incl Admin is fine, and we are ok updating Admin data, like fields, workflows etc. Problems appear when we try to select an Issue - all records are saying:
"There was an unexpected error while loading the issue.
If you think this message is wrong, please contact your JIRA administrators." when we select from a filter, or the issues menu.
Selecting from the 'Recent Activities' list usually works, but then when trying to edit, we get :
Close this dialog and press refresh in your browser", which removes the dialog, but does not resolve the problem.
No errors showing in the atlassian-jira.log either.
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