To view the version of SSH installed on your system, run ssh -V. Earlier versions used an MD5 signature, which is not secure. The OpenSSH client, which comes pre-installed on GNU/Linux, macOS, and Windows 10.To use SSH to communicate with GitLab, you need: You don’t need to supply your username and password each time. When you use SSH keys to authenticate to the GitLab remote server, GitLab uses the SSH protocol to securely communicate with Git. Then share or “push” your changes to a server. Git is a distributed version control system, which means you can work locally, Troubleshooting SSH connections GitLab and SSH keys.Overriding SSH settings on the GitLab server.Configure two-factor authentication (2FA).Use different accounts on a single GitLab instance.Use different keys for different repositories.Upgrade your RSA key pair to a more secure format.Configure SSH to point to a different directory.See if you have an existing SSH key pair.