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At least that points you to the problem: firewall somewhere.
Try a different port with your netcat test, perhaps? 51820 is the well-known WG port. Can't imagine they'd intentionally block it, but you never know.
Maybe Hetzner support can offer more guidance? Again, I'm not sure what or how they do network traffic before it gets to the VM. On all of mine, it's just a raw gateway and up to me to handle all port blocking.
If you figure that part out and are still stuck on the WG part, just shoot me a reply.
I tried to open the port 22 on UDP (yeah, I am getting pretty desperate over here...) and still get the message
no port[s] to connect to... Someone else on this post commented that I should stop using iptables for opening ports and start using something else as a firewall. Should I try this approach?Yeah, might be worth a shot. iptables is nice, but very verbose and somewhat obtuse.
I'd just clear out iptables completely and use
ufw. Should be in Debian's package manager.Here's a cheat sheet: https://www.digitalocean.com/community/tutorials/ufw-essentials-common-firewall-rules-and-commands
What do you mean with "clear out iptables completely"? Should I remove the iptables package with
sudo apt remove iptables?I believe
iptables --flushshould clear out any entries you've made. You can also reboot and clear them (unless you've got scripts bound to your interface up/down config that adds rules).Basically just need to get any custom iptables rules you made out of there and then re-implement any FW rules with
ufwYou can still use iptables alongside UFW, but I only use those for more complex things like port forwarding, masquerading, etc.
Alright, I switched to
ufwand... it's still not working. sighShould we just try something completely different? WireGuard doesn't seem to be working on my VPS. Someone in the comments mentioned tunneling via SSH, sounds interesting.
That would work, but I've noticed performance isn't as good as a UDP VPN that uses the kernel's tun module. OpenVPN is also an option, but it's a LOT more involved to configure (I used to run it before Wireguard existed).
The oddest part is you can't get a netcat message through. That implies firewall somewhere.
What is the output of your
ufw status?I've added some different ports for the future, but this is my
ufw status:I can't recall if
ufwopens both TCP and UDP or just TCP by default.Try explicitly allowing 51820/udp with
ufw allow 51820/udpI've added the firewall rule and it still says
no port[s] to connect towhenever I runecho "Testing" | nc -u SERVER_IP -p 51820. I feel like you're trying to stay on a sinking ship, so I would suggest to try another method to see if we even can get the whole "bypass CGNAT with a VPS" thing to work at all.Update: I've tried setting up SSH tunneling instead and it STILL doesn't work. I contacted Hetzner support about this issue and I'm hoping that they can resolve the firewall issues that I'm having.