Using an external domain name on a reverse proxy - QNAP

I'm trying to access an internally hosted application on my QNAP at my externally hosted domain, http://mydomiain.com, instead of http://mydomiain.com:12345

I can get the reverse proxy to work when I enter a local IP address of my network, for example the IP address of my QNAP, however, I can't seem to figure out why it wont work from an external domain name. As far as I can tell, the traffic flow is there, I just don't understand why it wont connect.

Is this whole thing even possible or is this not how reverse proxies work?

Current setup:

[External] - Domain DNS:

• A Record: Points to home IP address.

[Internal] - Home Router:

• Port forwards port 12345 to the IP address of the local server.

[Internal] - Home Server:

• Has a revserse proxy setup on the QNAP that is configured as such:

<VirtualHost *:80> ServerName http://mydomiain.com/ ProxyRequests Off <Proxy *> Order deny,allow Allow from all </Proxy> <Location /> Order allow,deny Allow from all </Location> ProxyPreserveHost On ProxyPass / http://localhost:12345/ ProxyPassReverse / http://localhost:12345/ ProxyStatus On </VirtualHost>

Ok, so it seems that my issue was on my home router. I was port forwarding the application port, where I needed to port forward port 80 to allow the web traffic.