Alright, well as of yesterday my dedicated server decided to crash, which is very normal every now and then, but what I didn’t expect was for it to not go back up, so I logged into RDP to see what was going down, and it seems the server startup was in abit of a loop. After abit of investigation it seemed my watchdog (Serverchecker) when going to ping the server to see if it was up, was returning false thus causing the loop.
So I had a look at the config and everything was fine but it still wouldnt go up, then I changed the port to 27016 and bingo, works first try. So I did abit more investigating and it seems nothing can connect on UDP Port 27015 on one of my IP addresses, but on any of the other 4 it works fine. I asked my datacenter about the issue, but they had no idea what-so ever to what was causing the issue as I disabled my firewalls and whatnot.
TL;DR
My server crashed and now it wont connect on port 27015, nothing else is using the port, have tried rebooting the dedi, have tried to run fresh installs of other games and no luck.
Open port 27015 in firewall. Client use UDP for the source engine. Most clients use 27005 for their client port. And most server use 27015 for there server port. Look if the packets are being denied with wire shark.
Yeah but listen if it’s a dedicated box the hosting company would no just block a port. So either he turned on the firewall or some how his magical host decide to block 27015 on ONE IP.