title: WSO2 IS and API Manager SAML SSO - Login to store/publisher fail
body: <p>I configure IS and AM with SAML SSO as described in official <a href="https://docs.wso2.org/display/AM160/Single+Sign-on+with+SAML+2.0" rel="nofollow">documentation</a>.
  SSO login for AM console function well, I can log in as admin using unique credendital as defined in IS.
  When I try to login to publisher or store, login is redirected to IS SamlSSO page as expected, but when I insert uid/pwd, browser is redirected to publisher login page asking for user credentials. AM carbon log report this WARN and ERROR:</p>
  
  <pre><code>TID: [0] [AM] [2014-05-07 17:27:28,171]  WARN {org.wso2.carbon.server.admin.module.handler.AuthenticationHandler} -  
  Illegal access attempt at [2014-05-07 17:27:28,0171] from IP address 192.168.50.60 : 
  Service is RemoteAuthorizationManagerService
  {org.wso2.carbon.server.admin.module.handler.AuthenticationHandler}
  TID: [0] [AM] [2014-05-07 17:27:28,172] ERROR {org.apache.axis2.engine.AxisEngine} - 
  Access Denied. Please login first. {org.apache.axis2.engine.AxisEngine} org.apache.axis2.AxisFault: Access Denied. Please login first.
  at org.wso2.carbon.server.admin.module.handler.AuthenticationHandler.authenticate(AuthenticationHandler.java:97)
  </code></pre>
  
  <p>any suggestion on how to solve this?</p>