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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I think I explained myself wrong. I have my unmanaged dedicated server with a provider. I purchased the cPanel license, and everything works fine until I do this with the games. I connect to the server via SFTP using Bitvise SSH Client. As long as we're connected this way, we can see the online game server and join without issues. But if we're not connected to SFTP, we can't see the game. This only happens with games that use UDP for connections.
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I don't think anyone on the cPanel side of things is going to be able to help with this issue as this isn't something that would be related to the cPanel tools. You might need to speak with your host - even though the server is unmanaged, since you mention issues with UDP they could at least check the network and confirm things are working well there.
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It's just that while I was using Virtualmin it worked fine, but I'll check with the provider to see what they tell me, thanks anyway cPRex :)
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