I haven't touched my ISE 1.3 lab setup for some time. When I tried to log in again I saw this - "Password is expired. Please reset your admin password."
This is a good security policy for production customer environment, annoying in lab environment. First let's reset the password, it has to be done via CLI:
If you want to disable this default 45-day admin password expiration policy, you can go back to UI, Administration > Admin Access > Authentication > Password Policy > Password Lifetime, uncheck the first checkbox.