sst100: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password)

This error message typically indicates that the SSH client is unable to establish a secure connection to the server.

There are a few possible causes for this error message:

1. Incorrect username or password: Double-check that you are using the correct username and password to log in to the server.

2. Incorrect SSH key: If you are using SSH key authentication, ensure that you have the correct private key and that it is in the correct location on your local machine.

3. SSH port blocked: Check that the SSH port (usually 22) is not blocked by a firewall or router.

4. Server configuration issues: There may be configuration issues on the server that prevent SSH connections from being established.

To troubleshoot this issue, you can try the following steps:

1. Check that you are using the correct username and password.

2. If you are using SSH key authentication, double-check that you have the correct private key and that it is in the correct location on your local machine.

3. Check that the SSH port (usually 22) is not blocked by a firewall or router.

4. Contact the server administrator to check for any configuration issues on the server.