- Plesk for Windows
The Allow only secure FTPS connections option is set at the Tools & Settings > Security Policy page.
Connection via FTPS fails with one of the following errors (depends on FTP client):
CONFIG_TEXT: Insecure server, it does not support FTP over TLS.
CONFIG_TEXT: 534 Policy denies SSL
CONFIG_TEXT: Local policy on server does not allow TLS secure connections
Settings for FTP site were manually changed in IIS.
Note: This article can be applied only if you have administrator access to Plesk.
Contact a hosting provider if you do not have admin access to Plesk.
Reconfigure FTP site:
Go to Tools & Settings > Security Policy.
Set the Allow both secure FTPS and non-secure FTP connections option and press the Apply button.
Set the Allow only secure FTPS connections option back and press the OK button.