SAML token from an external STS causes error

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  • Marc Scheuner

    SAML token from an external STS causes error

    Folks,

    I'm trying to figure out what's going on in our ASP.NET 2.0 app here.
    We're using .NET 3.0 WCF to communicate with tons of external web
    services.

    So far, we've been using Forms Authentication against our custom store
    to authenticate users, and when they are authenticated, we issued a
    SAML token for calling a plethora of webservices later on. Works like
    a charm.

    Now, we're about to switch to using an external STS (Security Token
    Server) to get our SAML tokens from - the users get authenticated
    against an Active Directory store, we get a SAML token for the user
    principal, and then off we should go.

    Should - because on the call to "RedirectFromLo ginPage" in the Forms
    auth mechanism, we now suddenly get an error:

    "Unable to encrypt the authentication ticket. Try changing the
    decryption key configured for this application."

    Any ideas what the heck that is, where it comes from, and how to deal
    with it??

    Any hints and pointers would be most welcome !

    Thanks
    Marc
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