502 proxy error on OS X 10.11 Server

Hello All,

New to OS X Server. Frustrating experience so far.

iMac running elCapitan, downloaded and installed the Server 5.04 app.

Following tutorials and set-up everything as a local network only for now.

But which ever tutorial I follow, whatever service I try, I keep getting 502 Proxy Error once I try to see results inside Safari (or Chrome),.

I'm really lost on this. Tried checking websites, but it just gives no solution at all.

Thanks and regards,
Luc