22.4.3. Limitations

There are a number of known limitations to this Tomcat valve-based SSO implementation:

Only useful within a cluster of JBoss servers; SSO does not propagate to other resources.
Requires use of container managed authentication (via <login-config> element in web.xml)
Requires cookies. SSO is maintained via a cookie and URL rewriting is not supported.
Unless requireReauthentication is set to true, all web applications configured for the same SSO valve must share the same JBoss Web Realm and JBoss Security security-domain. This means:
- In server.xml you can nest the Realm element inside the Host element (or the surrounding Engine element), but not inside a context.xml packaged with one of the involved web applications.
- The security-domain configured in jboss-web.xml or jboss-app.xml must be consistent for all of the web applications.
- Even if you set requireReauthentication to true and use a different security-domain (or, less likely, a different Realm) for different webapps, the varying security integrations must all accept the same credentials (e.g. username and password).

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