- Plesk Onyx for Windows
- Plesk Onyx for Linux
- The following option is enabled in Plesk > Tools & Settings > Database Hosting Preferences:
- Unable to create a database with username longer than 16 characters:
PLESK_ERROR: Error: Database user name is invalid. Only latin letters are allowed in the database user name
Plesk 17.0-17.8 doesn't allow to create MySQL database users longer than 16 characters.
Such unclear error is a bug PPPM-10708 that will be fixed in future Plesk updates.