Rules for User Names and Passwords of Plesk Users

User names and passwords of Plesk users should comply with the following rules of user names and passwords creation:

• User names of Plesk users should comply with the following rules:
  • A user name can include printed characters: letters, numbers, underscores ('_'), dots ('.'), and dashes ('-').
  • A user name must start with a letter or a number.
  • A user name must be more than 1 character long.
  • A user name length must not exceed 15 characters.

• Passwords of Plesk users should comply with the following rules:
  • A password can include only printed characters.
  • A password must not directly contain the user name.
  • A password length must not exceed 14 characters.
  • Minimal password length is 4 characters by default. This value can be changed in the PLESK_MIN_PASSWORD_LENGTH parameter of the [HKLM\SOFTWARE\PLESK\PSA Config\Config] key.

User names and passwords of mail users in Plesk should comply with the rules of user names and passwords creation described above as well as with the rules of the mail server.