This is a really strange problem. All of the relevant ports are open (I opened 27005 - 27500 on both TCP and UDP to be sure). Additionally, while Googling, I found this guide which said this:
so I opened 1200 and 26901 as well but the issues are persisting. Players can sometimes connect but then sometimes can’t. It happens to me too: one minute I can connect to the server, a few minutes later if I DC and try rejoining I will get “connect failed after 6 retries.” It never loses connection while connected.
Here is my port setup:
The server that is running on the default ports is not having these issues. sv_region on all servers is set to 0 and the machine is a dedicated Linux box hosted in some datacenter. I’ve tried Googling for a while but most threads I find on various websites are about port forwarding and people running servers from their house.
If anyone wants to try testing HLSW or any other tool the IP is 18.104.22.168