Cannot connect to Plesk over FTP: 530 Valid hostname is expected.

Benjamin Woellhardt

Updated July 16, 2026 11:30

Plesk for Windows kb: technical ABT: Group B

Applicable to:

Plesk for Windows

Symptoms

Unable to log in via FTP to a website hosted in Plesk:

CONFIG_TEXT: 530 Valid hostname is expected.
In FileZilla, the following error may appear in debug mode:

CONFIG_TEXT: GnuTLS error -48: Key usage violation in certificate has been detected
Hostname is set in FTP domain's binding in IIS > Server Name > Sites > 203.0.113.2.

Cause

The FTP domain's binding in IIS is incorrect.

Resolution

Note: This article requires an RDP connection to the server. If you do not have the necessary RDP credentials or full Plesk access, please contact the server administrator or the hosting support team responsible for your server.

Connect to the server via RDP and remove hostname from bindings in IIS > Server Name > Sites > 203.0.113.2 > Bindings...