How to protect a CS 1.6 server from hacking?

Question

Information Security

Hello, there is a cs 1.6 server: 195.128.158.53:27140 recently a hole was found in the security of the server, the SteamID of one of the Admins was generated, although none of the current admins have access to rcon, access to it was obtained, after that measures have been taken, the rights of all admins have been revised, access rights have been set, etc., I ask for practical advice on what can be added / changed in the operation of the server in terms of security, I understand that a lot has been written on the Internet on this topic, but still.

Answer 1

Erase the whole db, update dproto. I think it helped once.
Maybe help here and here .
GL&HF! :)