You really just need to examine the SSL certificate that your router is using for https. Are you saying you can login with https://router.asus.com:8443/ but not https://192.168.1.1:8443/ ?
View the certificate in your browser when the site is up (generally by clicking on the padlock icon, but I use Firefox). Is it a self-signed cert that Chrome doesn't like? Lot of different ways this could go, but we need to understand how your certificate is signed.
Yea its seems to be chrome only, I can login with default ip with microsoft edge, not tried any other browsers.
With chrome I can only login by using https://router.asus.com:8443/index.asp
Just realised could it be that i have no cert installed at all?