I have a live IP forwarding port 52000 on my RHEL 6.2 server.
My server listens to 22 and 52000 for traffic. The setup is working fine. Users from internet are able to login into the system.
But I want to restrict that only "admin" users should be able to login via 52000 port. root or other users should not be able to login into the system.
All other users should be able to login via port 22.
What are my possible options?