After securing Plesk with Let’s Encrypt, the certificate is not assigned to IIS FTP

Symptoms

• Plesk was secured by clicking on Plesk > Tools & Settings > SSL/TLS Certificates > + Let’s Encrypt ;

• Certificates on IIS FTP bindings were not modified, as can be seen in Internet Information Services (IIS) Manager > Sites > <IP Address> > FTP SSL Settings :

  

• There are subscriptions present on IP addresses, as reflected in Plesk > Tools & Settings > IP Addresses :

  

Cause

This is expected behavior. Plesk does not secure FTP sites on Windows.

Resolution

The functionality to install Lets Encrypt certificate for FTP sites is not implemented in Plesk.
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It is possible to apply the certificate to FTP manually:

1. Navigate to Plesk > Tools & Settings > IP Addresses > <IP Address> ;

2. Select a certificate from the dropdown list in SSL/TLS certificate section:

   

3. Click Ok . 

Warning: the certificate for FTP site will not be auto-renewed, it should be renewed manually