Trying to connect to Web Outlook App by external url and gets the router login

Hi,

I have set all my internal URL's and external URL's to mail.company.se(/Ecp/Owa and so on).
But when I try to connect to mail.company.se I end up in the login page to my router.
I have opened ports 25 and 443 and put my Exchange server IP as the host of both.

Anybody know a solution to this? 

Thanks