Thursday, 2 January 2020

SharePoint External Zone Site Down


Symptom:

  • After adding the new server to the farm and pointing the request using WFE, its failing Server application on _trust URL



Following error is logged:

Application error when access /_trust, Error=An XML error has occurred.

at Microsoft.SharePoint.SPSaml11BaseTokenHandler.ReadAssertion(XmlReader reader)

at Microsoft.IdentityModel.Tokens.Saml11.Saml11SecurityTokenHandler.ReadToken(XmlReader reader)



Cause:

  • There’s a Ping Federate setting “Include Raw Key in KeyValue”. If that is enabled, it will add a second RSA key to the SAML assertion causing the issue.



Resolution:

  • You need to change this setting as per the following article:


  • After you changed the setting the issue got resolved.

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