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Event ID: 5006 Source: PassportManager

Encryption key requested is invalid.
As per Microsoft: "This event fires if Passport Manager receives Tickets or Profiles that are encrypted in a key that does not exist on the server at all. This might indicate a hacking attempt in which someone is attempting to use a Ticket or Profile written into another .NET Passport site (which uses a different key) and is sending it to your site on the query string.
Alternatively, this could come from a very old Ticket or Profile that is already two steps removed from the current encryption key. If the encryption key were only one step removed, but expired, event 5012 would fire instead". See the link to "Troubleshooting Windows NT Events" for more details.

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