Hi,
I have a question in case of configuring SSO between a Domino-Server 6.5/7 and a WebSphere Portal Server 6.
I made all the tasks described in the WebSphere documentation, so I created the LTPA-key in the WAS and imported it into a Web SSO-Document in Domino. The Domain suffix is “.intern.lan” - I entered this value in the WEB-SSO-Document and also in the field “SSO_Domainname” in the WAS while creating the LTPA-key.
Now my problem is that the SSO between the two servers doesn’t work correctly. When I login myself into portal, the server generates a cookie including the LTPA-Token (Hash). After that I try to open a Notes-Database in a new browser-window and there comes the normal “Server Login”-Form that gives me the possibility to manually log in, but that wasn’t the aim you know. 
In the Domino Application Portlet that I use for integrating Domino-Applications into the Portal, there comes also the same form and also the following error:
Your session with the server has expired or is invalid. The current operation was not executed.
But here I can’t login with a user that has manager-access in the ACL. Why?!
I found two documents from IBM dexscribing the possible cause for the error-message, but both didn’t helped yet. The first document says that perhaps the clocks of the both server doesn’t match exactly, but I synchronizes them to nearly a second. The other technotes describes a situation in that a distinguished username is located in different directories with the same name but other password, but I haven’t this situation here in my testenvironment - I have only the Domino-Directory that stored some user information.
I’m really helpless and I hope you can help me…
Thanks a lot!
Many Greets from Germany!