- Plesk for Windows
Windows Server 2008 or 2008 R2 is used.
Setting an SSL certificate for a domain leads to using the same certificate by other domains.
The Secure Webmail button is missing on Plesk > Domains > example.com > SSL/TLS Certificates page.
One of the following notifications is shown in the Security section near the Certificate field on the domain's Hosting Settings page:
PLESK_INFO: The certificate change will also affect other sites hosted on the same dedicated IP address.
PLESK_INFO: The selected certificate will be used for all 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, select Dedicated and Click OK.
Go to Domains > domain to be secured > Web Hosting Access, select a dedicated IP address from the drop-down list and click OK.
Go to domain's Hosting Settings and select the domain certificate in the Security section. Then apply the changes.