### Problem to solve * What product or feature(s) affected? Gitlab-CE, chances are the same goes for EE Push Mirroring over SSH * What docs or doc section affected? Include links or paths. Lack of troubleshooting for Mirroring ### Further details A couple of points that tripped me up / were not mentioned the mirroring guide: `cannot add to known_hosts` error - You cannot add a DNS name in the `Git repository URL` as gitlab will try to add both IP and DNS to the temp known_hosts and throw up an error. Use IP address only. `permission denied` error - Use the Authentication method `SSH Key`, once you have clicked `Mirror Repository` you can add the key to your clipboard then headover to the remote git repo and add the key to `authorized_keys`. `cannot push objects` (sic) error - the objects in the remote repo need to be writable. ### Proposal Add the above troubleshooting tips to the mirroring docs ### Who can address the issue Anyone who can edit the docs page.