Permission denied (publickey,gssapi-keyex,gssapi-with-mic).

This error message typically occurs when attempting to authenticate to a remote server using SSH (Secure Shell) and the authentication method specified (publickey, gssapi-keyex, gssapi-with-mic) is not allowed or is not set up correctly.

There are several possible reasons for this error, including:

1. Incorrect username or password: Double-check that you are using the correct username and password for the remote server.

2. Incorrect SSH key: If you are using publickey authentication, make sure you have the correct SSH key for the remote server. You may need to generate a new SSH key or update the existing one.

3. Incorrect permissions on the SSH key: Make sure the permissions on the SSH key file are set correctly. The SSH key file should only be readable by the user who owns it.

4. SSH service is not running: Check that the SSH service is running on the remote server. If it is not running, you will not be able to connect using SSH.

5. Firewall blocking SSH traffic: Make sure there is not a firewall blocking SSH traffic to the remote server. You may need to add a firewall rule to allow SSH traffic.

To resolve the error, try the following:

1. Verify that you are using the correct username and password for the remote server.

2. Make sure you have the correct SSH key for the remote server.

3. Check the permissions on the SSH key file and ensure that it is only readable by the user who owns it.

4. Verify that the SSH service is running on the remote server.

5. Check if there is a firewall blocking SSH traffic to the remote server and add a firewall rule to allow SSH traffic if necessary.