- Plesk for Linux
- Plesk for Windows
When adding an FTP server using its IPv6 address as a remote FTP backup storage in Plesk at Tools & Settings > Backup Manager > Remote Stotage Settings, the operation fails with:
PLESK_ERROR: Server name is invalid.
This is a Plesk bug with ID PPPM-10421, which is planned to be fixed in future product updates.
As a workaround, configure an IPv4 address for the remote FTP server.