title: Why signature need in SAML request for ADFS?
body: <p>Following is the SAML request send to ADFS</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;samlp:AuthnRequest xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol" ID="_84e533b7-4310-41de-8ec7-0af7afeb7979" Version="2.0" IssueInstant="2015-12-02T09:44:30Z" ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Destination="https://XXXX.YYYY.ZZZZ/adfs/ls/" AssertionConsumerServiceURL="http://PPP.QQQ.RRR/SPDemo/Consume.aspx"&gt;
     &lt;saml:Issuer xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"&gt;http://XXXX.YYYY.ZZZZ/adfs/services/trust&lt;/saml:Issuer&gt;
  &lt;/samlp:AuthnRequest&gt;
  </code></pre>
  
  <p>After compressing and converting to Base64String it is redirected to ADFS.
  URL shown below with SAML request</p>
  
  <blockquote>
    <p><a href="https://XXXX.YYYY.ZZZZ/adfs/ls/?SAMLRequest=hZHNbsIwEIRfJfLdsfODAhZEouVQJKpGJO2hl8okS7Ga2KnXoTx%2bA0kluNCjrflmZ3bnKJu6FcvOHfQWvjtA561XC%2fIxjWESRbuExlHAaRxUQKdQJpTLfSL3sEtmyYx4b2BRGb0goc%2bJt0bsYK3RSe36Lx5MaBBSHhZ8JuJYRPydeJk1zpSmflC6UvpzQTqrhZGoUGjZAApXinz5vBG9o9gNIhRPRZHR7CUviLfqIyot3WXswbkWBWMaj%2fQn%2fAo5n9rQr6zqNX5tSlkzWe2R1ciIt0QEe%2bYejcauAZuDPaoSXrebwak3GtAjba2pgujWKc9W0Bg20r7E9kS8U1NrFJct3u%2fSjsVJOj%2brxWVZ9oq%2fj8u%2f8CQdo%2f7XGYd2yJzt0M3Z1dR0eN3ePf0F" rel="nofollow noreferrer">https://XXXX.YYYY.ZZZZ/adfs/ls/?SAMLRequest=hZHNbsIwEIRfJfLdsfODAhZEouVQJKpGJO2hl8okS7Ga2KnXoTx%2bA0kluNCjrflmZ3bnKJu6FcvOHfQWvjtA561XC%2fIxjWESRbuExlHAaRxUQKdQJpTLfSL3sEtmyYx4b2BRGb0goc%2bJt0bsYK3RSe36Lx5MaBBSHhZ8JuJYRPydeJk1zpSmflC6UvpzQTqrhZGoUGjZAApXinz5vBG9o9gNIhRPRZHR7CUviLfqIyot3WXswbkWBWMaj%2fQn%2fAo5n9rQr6zqNX5tSlkzWe2R1ciIt0QEe%2bYejcauAZuDPaoSXrebwak3GtAjba2pgujWKc9W0Bg20r7E9kS8U1NrFJct3u%2fSjsVJOj%2brxWVZ9oq%2fj8u%2f8CQdo%2f7XGYd2yJzt0M3Z1dR0eN3ePf0F</a></p>
  </blockquote>
  
  <p>But I am getting following error
  <a href="https://i.stack.imgur.com/p8KYj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/p8KYj.png" alt="enter image description here"></a></p>
  
  <p>Checking for detail error in Event Viewer I got
  <a href="https://i.stack.imgur.com/d5ck5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/d5ck5.png" alt="enter image description here"></a></p>
  
  <p>It seems that the server required the signed SAML request but I haven't mentioned anywhere that signed SAML request is required. Also <strong>SignedSamlRequestsRequired</strong> property is set to false
  <a href="https://i.stack.imgur.com/rddMp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rddMp.png" alt="enter image description here"></a></p>
  
  <p>So, <strong>Why ADFS 2.0 is asking for signed SAML request</strong>?</p>
  
  <p>Is there anything that is needed to be done so that signed SAML request is not required or if required what will be the value of signature that will signed the SAML request?</p>