ConnectTimeoutException or SocketTimeoutException error in logs
The following error appears in JIRA / my log file:
The cause may be a Fisheye/Crucible performance issue. To confirm that it really is Fisheye/Crucible taking a long time to respond, go to JIRA's Administration > Add-ons > Application Links and click in Fisheye Configuration for the Fisheye application link. Update the API Connection Timeout and API Socket Timeout fields.
If the problem is related to Fisheye/Crucible performance, then try implementing some performance improvements.