Cannot connect to server at all using -nomaster

Can anyone fix this? i want it to be hidden and join thro connect iphere,so ddosers doesn't find the ip by searching thro the server browser


when i've used it before it works just fine by people who i give them my ip to connect thro console , now even i cannot enter the server and it gets stuck in "Connecting to Server" and goes failed after a while , is it because of VAC? or this -nomaster no longer works? i really want to hide the server from the browser list so only me and my friends can play without ddosers getting the server ip thro browser.

Regards,
Vegeta