Problem
Synchronization is blocked if attachments are synced to a Windows Server.
Cause
If you use a Windows Server to host your Jira on-premise instance, then the problem might be caused by the special characters in the Connection name.
Windows has a set of characters that are not allowed for file names in the system. More details.
Solution
Update the Connection name via database query on both sides:
For Jira Server and HP ALM/QC
UPDATE "AO_08F1AF_RELATION" SET "NAME" = 'XXX' WHERE "ID" = YYY;
- XXX is the name of the Connection
- YYY the Connection ID