@Sunshine 

Thank you for your time to reply sir

Im using noip services

When I log into my account on noip I find updated ip address same as my router which means ddns is working and communicates with the router prerfectly and if I try to use ddns address on the same computer linked to the router it opens normal no problem however on a different network it wont.

I dont know what ports are normally opened on the router by default so I can try to use if it works

Example :

Example.ddns.net:xxxx

I tried 80, 8080, 443 but nothing happens

P.S: plz note that on the same computer wired to the router it works without specifying any port just putting example.ddns.net in the browser it opens the config page of the router.

Thank you so much and have a good day