Outgoing api call blocked

Hosting a front-end https://github.com/dvandal/cryptonote-nodejs-pool pool site. Used code is inside the website_example folder. The outgoing api call to the pool server on a different host is being blocked somewhere. Test with same files on a different host works straight out of the box.

The api call is being made to port 8117.

Server info
Distro Name: CentOS Linux release 7.7.1908 (Core)
Kernel Version: 3.10.0-1062.1.1.el7.x86_64
Platform: x86_64 kvm
Apache version: Apache/2.4.39
PHP version: 7.2.12 PHP-FPM is forced
MySQL version: 10.1.41-MariaDB
FTP version: 1.0.47
Web Servers: nginx-varnish-apache

I tried disabling the firewall and mod security but that doesnt make a difference.
Any other ideas where to look?

Thanks in advance.

When serving the files from http it seems to work and when let's encrypt certificate gets installed and it's served over https then it won't work anymore....

Any ideas anyone?

What error do you see? Have you checked log files in /usr/local/apache/domlogs?