If you have a new installation of Noah 4.15, the user will be asked to enter a password to log in. The default user is ABC, the default password for ABC is 123.  

Requiring passwords is enabled by default in Noah 4.15. If the user just clicks OK on the log in without entering a password, they will be presented with ‘Invalid login. Please try again.’

For upgrades to Noah 4.15, the Noah 4.14 settings are preserved. Users that were present in 4.14 and the user settings are the same.