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

[USY]

Server operating system version

Ubuntu 20.04 x86_64

Plesk version and microupdate number

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.



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



To be sure I also have turn OFF the "Security Level" on CF Firewall.


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.

 

[Dave W]

ss -lntp|grep 443

shows that nginx is only listening on the IP not localhost or 0.0.0.0

so use

curl -vv <yourIP>:443

 

[USY]

Thanks for the reply,

curl to the serverip on port 443 is fine.

As you can see some XenForo Addons require curl to localhost on port 433

I read this article:

How to enable loopback connections for WordPress cron in Plesk? - Support Cases from Plesk Knowledge Base

How to enable loopback connections for WordPress cron in Plesk? - Support Cases - Plesk Knowledge Base

www.plesk.com

But the loopback already exists.


So unfortunatelly this still doesn't solve the issue I got.

 

[scsa20]

This is not a Cloudflare Issue since the cURL is clearly trying to get data from the localhost itself (127.0.0.1). Even if it wasn't to the localhost, Cloudflare is only doing things from traffic coming into the server, not out so Cloudflare has no relevance in this case.

I see you've already posted on Xenforo's support forum and someone from their staff already responded back about a general outage that's causing that issue.