I can no longer log in via routerlogin.com/

[KTTFT]

I can no longer log in via routerlogin.com/, I get an error that I don't understand, any solution? I have a nighthawk RX500

[Netduma Fraser]

Could you provide the error that you're seeing exactly? That will help us identify what the potential problem is. You could provide a screenshot as well if it's easier. 

Try accessing via 192.168.1.1 and see if that works for you.