Resolved IPv6 address connect() failed (111: Connection refused) while connecting to upstream

[TomE]

Server operating system version

Ubuntu

Plesk version and microupdate number

18.0.52

Hello all,

I have a problem with ngnix in connection with ipv6 addresses. All visitors run into an error 502 bad gateway. In the logfile can always find the following

2023-04-28 18:35:27 Error 2001:4dd6:502:0:7096:ee2f:251e:21a3 1290#0: *190 connect() failed (111: Connection refused) while connecting to upstream nginx error

Strangely, this only affects visitors with ipv6, no problem with ipv4.

Does anyone have a tip for me?

Thanks and greetings
Tom

 

[Kaspar]

Do you have the Plesk Firewall installed and enabled? If so, what happens if you (temporarily) disable the Firewall?

 

[TomE]

Hi Kaspar,

thanks for the tip, you are right that was it. I installed fail2ban and had an error in a jail. After I deactivated the one everything runs fine.

Thank you very much!
Tom