- Plesk for Linux
Plesk is running behind NAT.
The preview URL showing with private IP instead of public IP, if Quick Preview on external domain name is enabled as Website Preview setting.
For example: http://domain.com.192.0.2.2.server.example.com/
This is Plesk bug with ID #PPPM-3687 which will be fixed in future Plesk updates.
As a workaround, add the following A-record:
*.<private_IP>.example.com A <public_IP>