SharePoint 2013: The SAML Assertion is either not signed or the signature…

Hi again!

Today I’m gonna explain a problem that I recently faced, I received a call from a customer, complaining about the SharePoint portal was down. Firstly, I tried to access to the portal and I was alarmed, I only see the error like: “Default Error in application server” nothing more. I observed that in the url stuck on https://appweb/_trust so I guess that something was happening with the ADFS.

I decided to check the Event Viewer log, and I found errors like the following:

Exception message: ID4220: The SAML Assertion is either not signed or the signature’s KeyIdentifier cannot be resolved to a SecurityToken. Ensure that the appropriate issuer tokens are present on the token resolver. To handle advanced token resolution requirements, extend Saml11TokenSerializer and override ReadToken.
   at Microsoft.IdentityModel.Tokens.Saml11.Saml11SecurityTokenHandler.ValidateToken(SecurityToken token)
   at Microsoft.IdentityModel.Tokens.SecurityTokenHandlerCollection.ValidateToken(SecurityToken token)
   at Microsoft.IdentityModel.Web.TokenReceiver.AuthenticateToken(SecurityToken token, Boolean ensureBearerToken, String endpointUri)
   at Microsoft.IdentityModel.Web.WSFederationAuthenticationModule.SignInWithResponseMessage(HttpRequest request)
   at Microsoft.IdentityModel.Web.WSFederationAuthenticationModule.OnAuthenticateRequest(Object sender, EventArgs args)
   at Microsoft.SharePoint.IdentityModel.SPFederationAuthenticationModule.OnAuthenticateRequest(Object sender, EventArgs eventArgs)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

So, after viewing that, we decided to ask to customer IT deparment if they has renewed the ADFS certificate, and bang! was that the reason of the error. So all you need to solve this problem is to renew the ADFS certificate in the SharePoint Server. To do that, you have to execute the following PowerShell scripts:

 

$certPath = "C:certstokensigner.cer"
$cert = New-Object System.Security.Cryptography.X509Certificates.X509Certificate2("$certPath")
New-SPTrustedRootAuthority -Name "Token Signing Certificate" -Certificate $cert
$sts = Get-SPTrustedIdentityTokenIssuer
$sts | Set-SPTrustedIdentityTokenIssuer -ImportTrustCertificate $cert

 

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