(Help) Port Forwarding 7171 router admin page doesn't work?

Hello, I needed to port forward port number 7171 (for tibia) but my router configuration page doesn't work, when I type in 192.168.1.1 (yes, that is the correct address) internet shows up this message:

This page can’t be displayed

• Make sure the web address http://192.168.1.1 is correct.
• Look for the page with your search engine.
• Refresh the page in a few minutes.

I am using the EE brightbox 2 broadband - I tried resetting it but still doesn't work!
I also tried pinging the router and I did get all replies so I have no idea what the problem is, can someone help?

It could be your ISP, I had a router that had this problem, after I contacted my ISP they told me to go to their website and login using my credentials and do w/e I want from there

Hmm il contact them later when I get home, hope it works thanks for the reply