Do a search for: 'Disable password expiration for a specific user' and add the user. But the authentication type for the user has to be Dx NetOps and NOT External
To validate
Log into portal shell
Connect to mysql and run the following commands
use netqosportal;
select UserID,Name,PasswordExpiration from user_definitions; where Name='username to change';
PasswordExpiration should be 0 ..... 0 means no expiration date for the user password