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So I was looking at a tutorial on how to play with friends in a private server but and my friends are still unable to join. How do I let my friends join my private server?

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    Could you add the tutorial you've been following to your post? That would make it easier to determine what's going on.
    – Regnegade
    Jun 22, 2021 at 18:42

1 Answer 1

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You have to forward ports in your router. Commonly you can reach your routers configuration at http://192.168.1.1 but it differs, your firewall might also be blocking connections. Ports that need forwarding seems to be:

  • UDP 27015

  • TCP 27015

  • UDP 27020

  • UDP 27005

(TCP and UDP 27015 should be the only required ones according to Valve: https://support.steampowered.com/kb_article.php?ref=8571-GLVN-8711)

Also enable the developer console and enter sv_lan 0 when you have started your private game.

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  • Can you tell where you got the list of ports from, and why one would need to enable the developer console and enter sv_lan 0?
    – Joachim
    Jun 22, 2021 at 19:02
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    Ports were taken from wiki.teamfortress.com/wiki/Linux_dedicated_server, sv_lan 0 is pretty standard when hosting Valve games, just tells the server that's it's not a LAN server. Jun 22, 2021 at 19:06
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    Found a Valve KB on required ports, added a clarification to the post. Jun 22, 2021 at 19:14

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