Symptoms
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Unable to log in via FTP to a website hosted in Plesk:
530 Valid hostname is expected.
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In FileZilla, the following error may appear in debug mode:
GnuTLS error -48: Key usage violation in certificate has been detected
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Hostname is set in FTP domain's binding in IIS > Server Name > Sites > 203.0.113.2.
Cause
Incorrect FTP domain's binding in IIS.
Resolution
Note: This article requires RDP connection to the server. If you don't have RDP credentials or full Plesk access, contact server administrator or hosting support that hosts your server.
Connect to the server via RDP and remove hostname from bindings in IIS > Server Name > Sites > 203.0.113.2 > Bindings...
with