I get the following error text: Unknown Server Error (500).
The following appears in the atlassian-jira.log:
java.lang.IllegalArgumentException: Error parsing media type 'application/DBF Viewer 2000'
This is caused by incorrect MIME handling by Windows when 'DBF Viewer 2000' is installed. The 'DBF Viewer 2000' program associates the .DBF file extension with 'application/DBF Viewer 2000' instead of 'application/octet-stream'. Remove 'DBF Viewer 2000' from the affected system. If you are still experiencing the issue I can suggest this program DBF Repair Toolbox https://www.repairtoolbox.com/dbfrepair.html