Symptoms
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When connecting to the Plesk server via FileZilla using a specific IP address, e.g. 203.0.113.2, the information about an expired SSL certificate appears.
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A valid SSL certificate is selected in Plesk at Tools & Settings > IP Addresses > 203.0.113.2 > SSL/TLS certificate field.
Cause
The expired SSL certificate is still used for securing the IP address in IIS.
This is a Plesk bug with ID PPPM-13940.
Resolution
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Connect to the Plesk server via RDP.
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Start Internet Information Services (IIS) Manager at Windows Strat > All Programs > Windows Administrative Tools.
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In IIS Manager, expand Sites > click on the IP address in question > FTP SSL Settings (under FTP).
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Choose a valid SSL certificate from the drop down menu under SSL certificate.
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Click Apply.
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