RT N12E not wordpress login

Hi there,

I have the following problem:

When I try to login to my wordpress site via www......com/wp-admin the login page does not show up. I know the problem is because of the ASUS router because I also tried it with my smartphone: when I'm connected to the WiFi, the login page does not show up. When I'm not connected to the WiFi then the login page appears.

Does anybody know a solution to this problem?

Thanks a lot