Hi, I had a similar problem, after I followed the security warning of IE10 under WIN 8 and changed the settings of my ASUS RT-N16 in order to enter the GUI via HTTPS. Result: afterwards login to my router was no longer possible. Instead now I got an error message, either saying that HTTP://192.168.1.1
can not be opened or that HTTPS://192.168.1.1
has a certificate problem, trying to cheat me.
I tried many solutions proposed in various forums, including power off and reboot of the router, but nothing helped. Then I tried RMerlin's proposal with various ports: no solution in my case. I tried various browsers: no change. It seems that WIN 8 no longer allows to bypass a certificate warning, as was possible with foregoing versions (I checked Microsoft's knowledge base without help for this problem).
Altogether that took me 5 hours sweating.
As I did not want to reset the router to factory settings (which would have required a complete new flash of DD-WRT firmware and configuration of my VPN), I finally tried https://192.168.1.1
in my internet browser on the Android smartphone: IT WORKED !!!
I could change the router GUI access back to http://192.168.1.1
and now fortunately access the router's website again from my PC.