PEM file can not be uploaded to Plesk: To read key from file or string use methods PleskExt\SslIt\OpenSsl\PrivateKey::fromFile() and PleskExt\SslIt\OpenSsl\PrivateKey::fromString()

Symptoms

• A purchased or self-signed certificate can not be uploaded to a Plesk domain as .pem file with the error:

  PLESK_ERROR: To read key from file or string use methods PleskExt\SslIt\OpenSsl\PrivateKey::fromFile() and PleskExt\SslIt\OpenSsl\PrivateKey::fromString()

Cause

This is a Plesk SSL It! Extension bug with ID EXTSSLIT-1993 "Unable to upload .pem certificates".

Fixed in:

• SSL It! 1.12.7 23 March 2023

Resolution

Please consider updating the SSLit! extension

Workaround

If update is not possible for some reason, you may try the following workaround:

• Open the certificate .pem file in any text editor and upload this by text parts as described on this article.