- Plesk for Windows
On Windows Server 2008 and Windows Server 2008 R2 when setting a certificate to the domain, other domains start to use the same certificate.
The following notification is shown in the Security section of Hosting Settings:
PLESK_INFO: The certificate change will also affect other sites hosted on the same dedicated IP address.
Windows Server 2008 and Windows Server 2008 R2 do not support Server Name Indication (SNI). This feature has been added in Windows Server 2012 and later versions.
SNI (Server Name Indication) allows to run any number of SSL/TLS sites with independent certificates on a single IPv4 address.
To use Server Name Indication (SNI), migrate to Windows 2012 or later versions.
As a workaround, assign each website to a dedicated IP address:
In Plesk go to Tools & Settings > IP Addresses and add a new IP address (Note: the new IP address should be public, not internal).
When it is created, click on this IP address and select Dedicated. Click OK.
Go to Domains > domain to be secured > Web Hosting Access and select a dedicated IP address from the drop-down list. Click OK.
Go to domain's Hosting Settings and select the domain certificate in the Security section. Then apply the changes.