When attempting to login to your router’s webUI, you may have run into the error below.

cannot Login unless logout another user first.

This error is usually caused by improperly closing router’s WebUI. This can occur if you are logged in and lose connectivity, or if your browser crashed.

Fortunately, the fix is simple… Assuming you have SSH enabled.

First, SSH into your router and run the two commands shown below.

admin@RT-AC66U:/tmp/home/root# nvram unset login_ip
admin@RT-AC66U:/tmp/home/root# nvram commit

See screenshot below

Now, attempt to login via the webUI. You should be able to log in without issue.

If you do not have SSH or telnet enabled, you can just power cycle your router.