On Virtual Private Server, ports are not reachable from the internet although no firewall is enabled

MHvM

10/6/23, 10:10 PM

I have a newly set up virtual private server running Ubuntu 22.04. ufw is still disabled, iptables -L tells me all chains have the ACCEPT default policy, no specific rules are defined. So I'd expect all ports to be open to the internet. I have a process listening on some port, this is confirmed by ss -lte.

However, I cannot reach this port from the internet and get "connection refused" when trying. nmap tells me the only open ports on the server are 22 for ssh and 80 for http, both of which I did not open.

Hosting provider support staff told me they do not have any kind of firewall or access restriction enabled.

So I'm out of my wits, I guess I'm missing something. What do I have to do to enable access to a specifc port? Why is it that ports 22 and 80 are open, but nothing else, when no firewall is running? Thanks for any advice!

0 + 5

ubuntu

iptables

ufw

gapsf

10/7/23, 4:58 AM

nft list ruleset

MHvM

10/7/23, 7:35 PM

@gapsf: ```nft list ruleset``` returns no output at all, so I guess there are no rules.

gapsf

10/8/23, 3:47 AM

Wjat ptables-save outputs?

MHvM

10/8/23, 7:33 AM

@gapsf: ```iptables-save``` outputs nothing. I don't think it's a firewall on the server; I'm quite sure there is none.

gapsf

10/8/23, 7:44 AM

Check the host you connecting from, your routers other divices on your side. Also I guess its hosting filtering despite whayt they says

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EN: On Virtual Private Server, ports are not reachable from the internet although no firewall is enabled

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