Access xampp from the internet?

[totallytech]

Hey All,
I've been struggling with this for a few hours now. I've installed XAMPP v3.2.2 on my win 10 pc.
I've installed apache and php but nothing else, Apache is using port 50 and 443.
I've got a static IP address and a domain name pointing to the domain name.

I've set up port forwarding on my router for port 50 to go to port 50 on my main machine (192.168.1.150) Other things on this pc are accessable fine, such as Plex and different software using different ports .
I've allowed full access to port 50 in the windows firewall.

On my main machine, if I try and view localhost:50 then it works fine, same as 192.168.1.150:50 is fine.
If I try to access 192.168.1.150:50 from my iphone on the same network then it times out.
If I try to access mydomain.com:50 (pointing to my static external ip address) then it also times out....

I'm assuming something is stopping my xampp install from being seen externally or on my network.

Can you point me in the right direction please?