Reasons and solutions for ssh not working in gitlab for a while

GitLab is one of the most popular code hosting platforms currently, allowing users to push or pull code through Git using SSH or HTTP. However, sometimes developers encounter issues such as SSH not working properly for a period of time. There are many root causes for this problem, so let’s explore a few possible solutions.

Is the SSH key expired

GitLab often checks the security of SSH. When the SSH key is not used for a long time, it is likely to be closed by GitLab. In this case, even though your SSH key appears to be valid on your local system, you will not be able to authenticate with GitLab. The solution is simple, just delete the current Key on your GitLab profile page, then regenerate one and add it to your GitLab account.

Is the SSH port blocked?

If you encounter connection timeout problems when using GitLab SSH, then it is likely that the SSH port is blocked. By default, the SSH port used by GitLab is 22, and this port may be used by cyber attackers on the Internet to invade the system. For security reasons, many network security teams will change the SSH port from 22 to other ports to protect the server from being invaded by bad actors. To solve the problem of SSH being unable to connect, you can check whether your host allows SSH connections and try to use the correct port number in the connection.

Whether the GitLab SSH service is started

GitLab's SSH service needs to be running on the server and listen to port 22 to provide services. If you encounter connection errors when connecting via SSH, you need to check whether the SSH service is started. You can use the following command on the server to check whether GitLab's SSH service is running:

sudo systemctl status ssh

The result should show something like "active (running)" indicating that the SSH service is running normally. If the service does not start, you can try to start it using the following command in the terminal:

sudo systemctl start ssh

User does not have permission to access the repository

Errors when connecting via SSH can also stem from permissions to access the GitLab repository insufficient. To ensure you have ssh access to GitLab, make sure you add the public key for your ssh key in your GitLab project. The public key can be generated on your local machine and then copied into GitLab. Also, make sure the public key is bound to your local machine, if you are on another machine you cannot access GitLab from the remote machine.

Conclusion

The SSH connection is not working properly, which will be very cumbersome when writing code and doing collaborative work. With a few simple steps, you can try to resolve these issues and get and manage your code securely and quickly over a GitLab SSH connection. A good SSH connection is key to mutual collaboration and smooth code development. If resolving your issue is extremely difficult, consider contacting the GitLab Community, which offers extensive support and the opportunity to answer some complex GitLab SSH questions.

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