This plugin hasn’t been tested with the latest three major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.

Single Sign On


Single Sign On allows a user to only sign in once and be signed in automatically across different systems.
Currently supported systems include:
* WordPress

The plugin works over multiple instances of the same system, for example multiple WordPress installations as well as between systems, for example between WHMCS and WordPress.


  1. Upload the single-sign-on folder to the /wp-content/plugins/ directory
  2. Activate the plugin through the ‘Plugins’ menu in WordPress.

Please visit SSO Server for more information.


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Contributors and Developers

“Single Sign On” is open source software. The following people have contributed to this plugin.


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Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.

Change Log


  • Updated contributors


  • Moved SSO Server code to Github


  • Added debug log
  • Fixed issue with endpoint URL’s entered without trailing slash
  • Fixed errors in readme.txt file


  • Fixed issue with hard coded endpoint URL
  • Verified compatibility with WordPress v3.6


  • Alpha release