If you have changed the shell default Port 22 on a cPanel powered server , restarting sshd from the WHM will fail. You have to ssh to the server and issue the following command to restart sshd…
* /sbin/service sshd restart
To, temporarily, reset your shell port back to 22, run the following command from the Address field in browser:
SERVER_MAIN_IP:2087/scripts2/doautofixer?autofix=safesshrestart
Now, you should be able to access shell, and you need to restart sshd at the prompt using the command mentioned above
Linux Server Guide 