We try everything In the web, application link, project links, permissions.
Sorry to hear that Jira is having problems trying to connect to these other development tools. There are number of different possible causes for these kinds of errors. Unfortunately the web interface of Jira isn't very good at telling us more information about why this is happening.
Ideally, we would want you to recreate this error once more, and then take a look immediately in the $JIRAHOME/log/atlassian-jira.log file. This log file should be recording some more details about why this might be failing in Jira.
I ran across two Jira KBs that have clear and specific error messages in the logs that might be applicable here:
The first KB deals with the system clock of the host operating system for Jira and Bitbucket being too far out of sync. When this happens, the OAuth authorization fails.
The second KB deals with a scenario where the database that Jira is using on the backend might not have the needed permissions to be able to search in SQL as expected. However before trying either resolution, I would want to make sure that you see the corresponding logs that indicate this is the problem.
If neither of those apply, then there is a third more general troubleshooting KB for this topic that also contains a few different causes for this error here, check out Troubleshoot the Development Panel in Jira server.
If you are having any trouble following these steps, I would be interested to see if we can take a closer look at your Jira logs to see if we can be additional assistance in pinning down the root cause here.
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