Hello, my server cs 1.6 is listed as offline on gametracker.com, but he is on. The server is hosted, I spoke with the hosting company and they said there is no problem with them. My question is if you can detail what should be done at the firewall, because from what I read here on the forum issue would be to firewall those hosteaza server.

If you're server stays offline, the port is likely blocked.

If it goes off and on, your server is likely temporarily blocking the scanner... such as thinking it might be "spam."