I want to use my raspberry pi's webserver all over the world. so i decided to use no-ip DNS. I installed everything on my pi and started no ip with `sudo noip2`. I set up everything on the no-ip website (Hostname, address..) as well. 

Then i checked with `nslookup` if the connection between my IP-Address and the No-Ip Domain is correct. Everything is ok.
But now when i type in my domain in my explorer, my webserver page does not appear.

I think my router doesn't allow the connection. Can someone help me with the forwarding? And what ports do i need? 
Or what else could be the problem?

Thanks

**EDIT** 

Im using a TP-Link TL-WR841N router. On my RPi i have a Webserver with a mysql database running. 

I forward Port 80 to my RPi static IP address 192.168.1.190.

At home i have a router which is connected to the ISP. 1 cable is connected to the WLAN router which im talking about right now. so it is possible that my WLAN router is not the problem, but the router which is connected to the ISP? I have 2 routers because the routers are on different floors.

**SOLUTION**

Its working right now! I had to open the Port 80 also on my second router which is directly connected to the Internet.