cURL error 7: Failed to connect to localhost port 443: Connection refused

Question

OS version: Ubuntu 20.04 x86_64 Plesk version: Plesk Obsidian 18.0.47.5

Hi,

I am running XenForo Forum on my Plesk which running behind Cloudflare. I get following erro log, which is showing me that the curl connection to localhost on port 443 is refused. https://prnt.sc/hN7k9PsJUCA-

All curl’s to localhost, 127.0.0.1 and 0.0.0.0 are refused:

root@srv:~# curl -vv localhost:443 * Trying ::1:443... * TCP_NODELAY set * connect to ::1 port 443 failed: Connection refused * Trying 127.0.0.1:443... * TCP_NODELAY set * connect to 127.0.0.1 port 443 failed: Connection refused * Failed to connect to localhost port 443: Connection refused * Closing connection 0 curl: (7) Failed to connect to localhost port 443: Connection refused root@srv:~# curl -vv 127.0.0.1:443 * Trying 127.0.0.1:443... * TCP_NODELAY set * connect to 127.0.0.1 port 443 failed: Connection refused * Failed to connect to 127.0.0.1 port 443: Connection refused * Closing connection 0 curl: (7) Failed to connect to 127.0.0.1 port 443: Connection refused root@srv:~# curl -vv 0.0.0.0:443 * Trying 0.0.0.0:443... * TCP_NODELAY set * connect to 0.0.0.0 port 443 failed: Connection refused * Failed to connect to 0.0.0.0 port 443: Connection refused * Closing connection 0 curl: (7) Failed to connect to 0.0.0.0 port 443: Connection refused 

UFW Firewall is disabled:

root@srv:~# sudo ufw status Status: inactive 

netstat show me that port 443 is active and listen: https://prnt.sc/CqBFLdPYneBB

To be sure I also have turn OFF the “Security Level” on CF Firewall. https://prnt.sc/S_z-4jgTaNCU

No matter what I’ve tried, so far unfortunately without success.

I would therefore be very grateful for any tip or solution to solve this issue.

Regards.