Weblogic 10.3.5.0 SAML2 SSO -> Error 403

Weblogic 10.3.5.0 SAML2 SSO -> Error 403

i configured 2 weblogic domains with managed servers as seen in Biemond's
blogpost i used the
DemoIdentity & DemoTrust
i enabled SSL and added to the web.xml of my deployed app:
<login-config>
<auth-method>USER-CERT</auth-method>
<realm-name>myrealm</realm-name>
</login-config>
<security-role>
<description>These are the roles who have access</description>
<role-name>admin</role-name>
</security-role>
and mapped this role to a principal (a user i added in both weblogic
servers/domains) in my weblogic.xml file. But it doesn't work. Everytime i
get
Error 403 -- Forbidden
anyone else with this problem? or maybe a solution?
Thanks for your help!