The Asus Router RT-N66U Router's admin website changed a few versions back to prevent pasting into the login password field.
Firmware 188.8.131.52.378_6117 (Latest as of 9/12/2015)
Given I use a randomly generated password it is annoying to type manually. Asus has 16 character password limit. Browser password storage is not desired. Autotype is not a good solution since the password manager is in an isolated non-networked VM.
I saw SSH access is possible, so perhaps a trick can send the GUI over SSH. Perhaps the username/password be passed in through a URL although post login firefox history does not show a page with the URL clue.
How can I make password entry easier?