Sharepoint 2010 APM Session Expiration

Hi, I'm using APM v11.2.1 with Sharepoint 2010 and SSO. All is working as expected except the logout detection. I put the following into "Logout URI Include" into the used access profile: "/_layouts/SignOut.aspx" but this doesn't work. The session is always keeped open even when I wait the timeout of 5 seconds (default).

 

I tried the same with a v11.4.1 installation and this also doesn't work.

 

Does anyone know how to troubleshoot this kind problem?

 

Many thanks for your reply.

 

Peter