Hi

My server does not work. I opened all ports and disable the firewall

Game: Half Life 1
Port: 27019
Ip: 181.166.33.2

One of the following suggestions may help you:
Your server is currently offline.
GameTracker needs your server to be online before you can add it to our database. Please restart your server and make sure it's up before hitting ADD SERVER again.
You entered the wrong query port.
Please update your query port and hit scan again
Your server is firewalled.
Please turn off any firewall you have that may block scanning or whitelist the gametracker scanning IP addresses:
208.167.241.190
208.167.241.185
208.167.241.186
208.167.241.183
208.167.241.189
108.61.78.147
108.61.78.148
108.61.78.149
108.61.78.150

I can not find a game server at 181.166.33.2:27019

Either your server is down, the port is incorrect, or a firewall is blocking.
As I could ping (ICMP echo) the IP address, it is probably not the firewall.