SAML Request Processing Error, Description: Event ID 303

Rengarajan | Fri, 24 Apr 2020 at 15:27 hours | Replies : 1 | Points : 50

Category : ADFS

Hi All,

we got multiple SCOM alert for the Event ID 303

Log Name: AD FS/Admin
Source: AD FS
Date: xxxxxxxxxxxxx
Event ID: 303
Task Category: None
Level: Error
Keywords: AD FS
User: xxxxxxxx
Computer: xxxxxxxx
The Federation Service encountered an error while processing the SAML authentication request.

Additional Data
Exception details:
System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.IdentityServer.Web.Protocols.Saml.SingleLogoutService.LogoutNextSessionParticipant()
at Microsoft.IdentityServer.Web.Protocols.Saml.SingleLogoutService.ProcessMessage(SamlMessage samlMessage, BindingInformation bindingInformation, Boolean partialLogout, Boolean validResponseMessage, Boolean& validLogoutRequest)
at Microsoft.IdentityServer.Web.Protocols.Saml.SamlProtocolManager.Logout(HttpSamlMessage logoutMessage, String sessionState, String logoutState, Boolean partialLogout, Boolean isUrlTranslationNeeded, HttpSamlMessage& newLogoutMessage, String& newSessionState, String& newLogoutState, Boolean& validLogoutRequest)

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Please check that ADFS relaying party must have valid URL for Logout for Relaying party.

1. Go to Relaying party Properties.

2. Go to EndPoints tab.

3. Check if "SAML Logout Endpoints" has valid Logout URL.


Hope it will help you.

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