Cloudflare Error 523 - How to debug? Started today (worked before)

General
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I’m the owner of VPS + Domain. My domain works well with Cloudflare, but I started experiencing an issue in specific port (8443) which worked before.

Cloudflare returns:

# Error 523

Ray ID: 60948651dc67edbb • 2020-12-29 15:23:52 UTC

## Origin is unreachable

I expect my website to show up with errors if there are, instead I’m getting ERROR 523 from Cloudflare and I have no idea how to debug it.

Locally I get 404:

[root@vps ~]# wget https://127.0.0.1:8443 --no-check-certificate
–2020-12-29 17:39:14-- https://127.0.0.1:8443/
Connecting to 127.0.0.1:8443… connected.
WARNING: cannot verify 127.0.0.1’s certificate, issued by ‘/C=US/O=Cloudflare, Inc./OU=Cloudflare Origin SSL Certificate Authority/L=San Francisco/ST=California’:
Unable to locally verify the issuer’s authority.
WARNING: certificate common name ‘Cloudflare Origin Certificate’ doesn’t match requested host name ‘127.0.0.1’.
HTTP request sent, awaiting response… 404 Not Found
2020-12-29 17:39:14 ERROR 404: Not Found.

Any idea what could have gone wrong?

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