Webserver/website.

[schumaku]

Ok, Web server - reconfigure from port 8082 to 80.

Test from the LAN http://[NAS-LAN-IP-address]/ first ...

[Sadsad]

Connecting to NAS IP 192.168.0.198 Profit!
Port:80 Port:80 # Connecting to WAN IP xxx.xxx.xxx.xxx Nothing happens #
Qnap 192.168.0.198 >>> Webserver >>> Ruter forward >>>
Port:8082 Port:8082#
Connecting to NAS IP 192.168.0.198:8082 Profit!
Connecting to WAN IP xxx.xxx.xxx.xxx:8082 Profit!

[chrisskaug]

Go to your Qnap's admin web-interface. I believe in your case that it should be http://192.168.0.198:8080 from your local network.
Navigate to Network Services - Web Server as shown here:
(Image link removed - server asking for auth - The Moderator)

Change the "Port Number" from 8082 to 80 like shown in this image:
(Image link removed - server asking for auth - The Moderator)

Now you should be able to reach your web site without the port number 8082 in the URL.

If you still cannot reach your web server through the WAN address, then your ISP (or something else in your network infrastructure) is most likely blocking port 80. In which case there isn't much you could do other than using i.e. 8082.