Error 303 or Error 364 on ADFS 2.0 identity provider

Hello,

SAML plugin version Version 0.9.2

I’ve configured the SAML plugin up until a point where ADFS2.0 throws an error. Here’s what the ADFS admin gave me:

——————–
Error 303

The Federation Service encountered an error while processing the SAML authentication request. 

Additional Data
Exception details:
Microsoft.IdentityModel.Protocols.XmlSignature.SignatureVerificationFailedException: MSIS0037: No signature verification certificate found for issuer 'https://dev.example.com/blog/wp-content/plugins/saml-20-single-sign-on/saml/www/module.php/saml/sp/metadata.php/1'.
   at Microsoft.IdentityServer.Protocols.Saml.Contract.SamlContractUtility.CreateSamlMessage(MSISSamlBindingMessage message)
   at Microsoft.IdentityServer.Service.SamlProtocol.SamlProtocolService.CreateErrorMessage(CreateErrorMessageRequest createErrorMessageRequest)
   at Microsoft.IdentityServer.Service.SamlProtocol.SamlProtocolService.ProcessRequest(Message requestMessage)

——————–
Error 364

Encountered error during federation passive request.

Additional Data

Exception details:
Microsoft.IdentityServer.Web.RequestFailedException: MSIS7012: An error occurred while processing the request. Contact your administrator for details. ---> System.ServiceModel.FaultException: The creator of this fault did not specify a Reason.
   at Microsoft.IdentityServer.Protocols.Saml.Contract.MSISSamlProtocolContractClientManager.ProcessRequest(Message request)
   at Microsoft.IdentityServer.Protocols.Saml.Contract.MSISSamlProtocolContractClient.ProcessRequest(MSISSamlRequest samlRequest)
   at Microsoft.IdentityServer.Protocols.Saml.Contract.MSISSamlProtocolContractClient.ProcessRequest[T](MSISSamlRequest samlRequest)
   at Microsoft.IdentityServer.Protocols.Saml.Contract.MSISSamlProtocolContractClient.CreateErrorMessage(HttpSamlMessage httpSamlMessage, SamlStatus status)
   at Microsoft.IdentityServer.Web.FederationPassiveAuthentication.SendSamlError(SamlStatus status)
   --- End of inner exception stack trace ---
   at Microsoft.IdentityServer.Web.FederationPassiveAuthentication.SendSamlError(SamlStatus status)

System.ServiceModel.FaultException: The creator of this fault did not specify a Reason.
   at Microsoft.IdentityServer.Protocols.Saml.Contract.MSISSamlProtocolContractClientManager.ProcessRequest(Message request)
   at Microsoft.IdentityServer.Protocols.Saml.Contract.MSISSamlProtocolContractClient.ProcessRequest(MSISSamlRequest samlRequest)
   at Microsoft.IdentityServer.Protocols.Saml.Contract.MSISSamlProtocolContractClient.ProcessRequest[T](MSISSamlRequest samlRequest)
   at Microsoft.IdentityServer.Protocols.Saml.Contract.MSISSamlProtocolContractClient.CreateErrorMessage(HttpSamlMessage httpSamlMessage, SamlStatus status)
   at Microsoft.IdentityServer.Web.FederationPassiveAuthentication.SendSamlError(SamlStatus status)

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I’m using a a generated certificate, generated by clicking on “Generate a new certificate and private key for me” on that page wp-admin/options-general.php?page=sso_sp.php.

Has anyone had a similar problem? Has anyone a workaround or fix for this problem?

https://wordpress.org/plugins/saml-20-single-sign-on/