Just recently connected to my test NSX-T environment and found that my password is espired.
Actually it is admin credentials. See picture below:
 
NSXT password expired
 
Fix is eazy, just SSH to the host and update the admin passwrd.
 
You are required to change your password immediately (password aged)
WARNING: Your password has expired.
You must change your password now and login again!
Changing password for admin.
(current) UNIX password:
New password:
Retype new password:
 
After updating the password over CLI, you can successfuly login over UI.
 
Password expiration is 90 days by default.
 
To avoind this issue in the future we can extend expiration dates using next command:
set user admin password-expiration 9999
 
To check the expiration date:
get user admin password-expiration
Thu Nov 09 2021 UTC 00:36:18.240
Password expires 9970 days after last change. Current password will expire in 9970 days.