A purchased or self-signed certificate can not be uploaded to a Plesk domain as
.pemfile 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()
This is a Plesk SSL It! Extension bug with ID EXTSSLIT-1993 "Unable to upload .pem certificates".
- SSL It! 1.12.7 23 March 2023
Please consider updating the SSLit! extension
If update is not possible for some reason, you may try the following workaround:
- Open the certificate
.pemfile in any text editor and upload this by text parts as described on this article.