What can be done when Jenkins fails to establish a connection with Git repository?

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There are several steps that can be taken when Jenkins fails to establish a connection with Git repository:

1. Verify that the Git repository URL is correct and reachable.
2. Ensure that the Jenkins server has the appropriate credentials and permissions to access the Git repository.
3. Check the Git plugin installed in Jenkins and verify that it is up to date.
4. Check the network connection on the Jenkins server and ensure that it can access the Git repository.
5. Restart Jenkins and try again.
6. Try cloning the Git repository manually in the Jenkins server to ensure that there are no issues with the Git repository or the server.
7. Check the Jenkins log files for more information on the connection error and try to fix the issue accordingly.