Single Sign On (SSO) is the ability for users to authenticate to a single web application, and by means of a successful authentication, to be granted authorization to multiple other applications. Clustered SSO stores the authentication and authorization information in a clustered cache. This allows for applications on multiple different servers to share the information, and also makes the information resilient to a failure of one of the hosts.
A SSO configuration is called a valve. A valve is connected to a security domain, which is configured at the level of the server or server group. Each application which should share the same cached authentication information is configured to use the same valve. This configuration is done in the application's
Some common SSO valves supported by the web subsystem of JBoss EAP 6 include:
Apache Tomcat ClusteredSingleSignOn
Apache Tomcat IDPWebBrowserSSOValve
SPNEGO-based SSO provided by PicketLink
Depending on the specific type of valve, you may need to do some additional configuration in your security domain, in order for your valve to work properly.