Suggested to post here by @pppery. Original post is in Arqade.

So I've been trying for more than two weeks to run a L4D2 Dedicated Server.

However, no one but me can connect to it. I did port forwarding, enabled DMZ and allowed from port 26900 to 27050 on my firewall.

Now, this is an issue I've seen here and in AlliedModders' forums. Even I posted about it, and at some point managed to fix it by adding

sv_allow_lobby_connect_only 0
sm_cvar sv_hibernate_when_empty 0

to my server.cfg file, but then the issue came back out of nowhere and it appears I'm in Carrier-Grade NAT. I still wonder how I managed to bypass it.

Now to the main question, why is a local server hosted through the game joinable by others, but a dedicated server isn't, when in both cases CGNAT is present?

Also, another question: Is it possible to run SRCDS using OpenVPN? If so, how can I do this? Is there a guide for it?


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