Article ID: 121274, created on Apr 23, 2014, last review on Jun 17, 2016

  • Applies to:
  • Plesk


How to activate the Server Name Indication (SNI) support on the Plesk server?


By default, on clean Plesk installations (Linux and Windows) the support for SNI is turned on.

In case of Plesk upgrade on Windows from version 11.0 or earlier, the support for SNI is switched off. It can be turned on in Tools & Settings > Server Settings.

To enable SNI support by Plesk on Linux:

# vi /etc/psa/psa.conf

# service psa restart

The SSL support with SNI is possible only if the following requirements are met:

  1. The operating system of Plesk server supports SNI.
    • Linux systems (see the full list in the release notes).
    • Windows Server 2012.
  2. Users' browsers support SNI.

Release notes for Windows: 10.4.4, 11.0.9, 11.5, 12.0, 12.5

Release notes for Linux: 10.4.4, 11.0.9, 11.5, 12.0, 12.5

Note: most modern web browsers, starting from IE 7, Firefox 2.0, Opera 8.0, and Chrome 1.0, support SNI, unless they are run on Windows XP. To learn more about SNI and the client software that supports it, refer to

If SNI is not supported and Plesk administrator assigned an SSL certificate to a website hosted on a shared IP address, Plesk will associate that certificate with all other websites hosted on this IP address. In the same case, hosting customers with shared IP addresses will not be able to assign SSL certificates to their sites: the Websites & Domains > domain_name > Secure Your Sites button will be hidden in their Control Panel.

For instructions on assigning SSL certificates to websites, refer to the Administrator's Guide, Plesk 12.5.

The links below can be helpful for you also:

How to check if Apache with SNI support is installed

SNI (Server Name Indication) does not work for my domains

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