Missing Signature Error for SP-Initiated SAML Request

Version Affected:  9.3+

Description:

Error occurs after logging into the realm.

Message="SAML20SPInit exception error: Object reference not set to an instance of an object., stack: at SAML20SPInit.ReceiveAuthnRequest(AuthnRequest& authnRequest, String& relayState)

Cause:  

Signature needs to be validated and there is nothing populated in the SAML Request Certificate section.

Resolution:  

Paste public key of the certificate being used for their signature in the ACS / SAMLRequest Certificate section on the Post Authentication Tab.

You should also be able to see the signature through a SAML Trace.
 

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