title: SAML 2 Signature error in ADFS 2.0
body: <p>In our SSO scenario, we are using ADFS 2.0 as IDP and Shibboleth as SP. It is an SP-initiated sign-on. After configuring, when I try to establish communication between Shibboleth and ADFS 2.0(throw browser redirect), ADFS 2.0 is throwing the below error.</p>
  
  <blockquote>
    <p>The verification of the SAML message signature failed. 
    Message issuer: <code>http://sampleserver/adfs/services/trust</code> 
    Exception details: 
    MSIS1015: Server required signed SAML AuthenticationRequest but no signature present.</p>
  </blockquote>
  
  <p>Event id - 320
  Related Event id - 364</p>
  
  <pre><code>&gt; Microsoft.IdentityServer.Service.SamlProtocol.SamlProtocolSignatureVerificationException:
  &gt; MSIS1015: Server required signed SAML AuthenticationRequest but no
  &gt; signature present.    at
  &gt; Microsoft.IdentityServer.Service.SamlProtocol.SamlProtocolService.ValidateSignatureRequirements(SamlMessage
  &gt; samlMessage)    at
  &gt; Microsoft.IdentityServer.Service.SamlProtocol.SamlProtocolService.Issue(IssueRequest
  &gt; issueRequest)    at
  &gt; Microsoft.IdentityServer.Service.SamlProtocol.SamlProtocolService.ProcessRequest(Message
  &gt; requestMessage)
  </code></pre>
  
  <p>We haven't used any signature yet. I also have made <strong>SignedSamlRequest</strong> to false in ADFS properties. Signing of SAML at Shibboleth was also disabled.</p>
  
  <p>I could not find any information in Microsoft site - apart from generic guide for this sort of errors.</p>
  
  <p>Please advice on this error. </p>