How to set up Plesk to use one certificate for all domains?

kb: how-to Plesk for Linux ABT: Group A

Applicable to:

How to change default certificate in Plesk?

All the domains that have SSL support and do not have custom certificates assigned, will use the default one.

Create a certificate and make it default server-wide.

Via Plesk UI

Via files. Choose *.key and *.crt files. *-ca.crt part is optional. Click Upload certificate:
As text. Fill in the fields Private key and Certificate. The field CA Certificate is optional. Click Upload certificate:

Via CLI

Connect to the server via SSH
Create a certificate. Specify the certificate name and all certificate files in the command. Parameter -default will mark it as default server-wide:

# plesk bin certificate -c <certificate_name> -admin -default -key-file <file.key> -cert-file <file.crt> -cacert-file <file-ca.crt>
If the certificate is already uploaded, run the following command:

# plesk bin certificate -u <certificate_name> -default -admin

Note: Make sure that the new certificate is assigned to domains IP address at Plesk > Tools & Settings > IP addresses > 203.0.113.2.