SAP (SAP Portal) & .NET (SharePoint Portal Site) ... is there a way to have a single sign on for both of them?

I'm working on a SharePoint portal site, while user should be redirected to it from SAP Portal, both of the two portal, user is going to be authenticated through Active开发者_StackOverflow社区 Directory.

So is there a way to have a single sign on for both of them, so user login to SAP portal and then be redirected to sharepoint portal without providing his login credentials again?

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I'm not an expert on this area (and definitively not one on SAP) but if your SAP Portal and your SharePoint are set-up using the same authentication mechanism (eg : ntml or Kerberos) and you have windows authentication, this should be transparent (assuming the current user is member of any group of SharePoint that has at least a read access).

One of the client I had been working with had a similar scenario, a SAP Portal, several SharePoint site collections and share authentication across them, but there were relying on a dedicated SSO solution from Novell.

This forum discussion seems to cover a similar requirement