very weird problem
I don’t know how to explain the strange issue I’m having with my dedicated server. I set up Minecraft servers on any port, and they work perfectly—people can join without problems. However, when I set up servers for games like Rust, Ark, 7D2D, Project Zomboid, or Palworld (with all their required UDP ports open), no one can connect. I’ve even turned off the (CSF) firewall, but the same issue persists. Strangely, if I connect via SFTP, I can see the server is running and access it normally. What could be causing this?
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Hey there! I'm not sure what would be causing this. I'm guessing you meant SSH and not SFTP - are you able to telnet from your local workstation to the server on any of the ports those tools use? That would be a good initial test to see if the ports are working externally to the machine.
It's also possible that your hosting provider doesn't have those ports open on their network if they aren't ones that commonly used, and this test would help to show that.
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yes, I connect to my server by SFTP with "Bitvise SSH Client" try again and I still have the same problem, while I am not connected to the server by SFTP I do not see the game but if I connect by SFTP I see the server, and I have tried with the firewall on or off same problem, but it only happens when the game uses UDP.
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Hi,
If you can connect to the game services from within the server, but not outside, that also suggests there could be an external firewall blocking UDP traffic on those ports as cPRex suggested. If you can connect to the server via SSH, you can run some tests with tcpdump and ncat to see if the server is able to receive any UDP traffic over those ports. If the server is not able to receive any UDP traffic over those ports even with tcpdump, it's a strong indicator of an external firewall blocking traffic.
Both tcpdump and ncat have options to listen for UDP traffic instead of TCP. We have a troubleshooting guide for this below:
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