SSH Authentication Failure: Connection Denied Due to 'Permission Denied (publickey, gssapi-keyex, gssapi-with-mic)'

Solution Verified - Updated -

Issue

  • When attempting to establish an SSH connection to a Red Hat Enterprise Linux system, users may encounter the following authentication failure message:

     # ssh -vvv user@rhel_vm
 .
 .
 .
 debug1: No more authentication methods to try.
 root@rhel_vm: Permission denied (publickey,gssapi-keyex,gssapi-with-mic).

  • This error indicates that the SSH server is not allowing authentication using the available methods, preventing the user from logging in successfully.

Environment

  • Red Hat Enterprise Linux (all versions)
  • OpenSSH

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