I have two servers on the same network, server “A” is the Web server for our lan party website that is running Debian 9.4 with Apache2 and gets SSL certificate from LetsEncrypt.
Server “A” is also responsible to proxy every request to server “B” and upgrade the connection to use HTTPS
Server “B” is running Ubuntu 18.04 a dedicated Gitlab server (In a Docker container) for development for the website and other tools we use on the party
Every thing works fine when i use HTTPS but,
The problem begins when i try to setup HTTPS then i always gets
> Service Unavailable > The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
What i have tried til now is
I Have read this site to try to enable HTTPS
Using this config file on Apache2
tried to change diffrent headers on the proxy
And much more