I have seen reports elsewhere in the forums mentioning the error above, although in those cases, it’s an “SP-initiated SAML response”. In those cases, it was determined to be related to the SAML_SessionId cookie. Would that be the same for this message, or is there something else that I should be looking for?
It shouldn’t be related to the SAML_SessionId cookie in this case as no previous state is required.
What version of the SAML library are you using?
Please enable SAML trace and send the generated log file as an email attachment to support@componentspace.com mentioning your forum post.