Why can't I open the h & m page in my Wi-Fi network?

This error message has been coming for months, regardless of whether I want to log in with my cell phone, laptop or tablet. This is only the case with my Wi-Fi at home, elsewhere. Restarting the router does not help. To help, is summer sale😬

http://m2.hm.com/

because that's the side

Thanks, but it doesn't work either. The app doesn't hang either.