ACS75005 "The request is not a valid SAML2 protocol message." Shown whenever I connect to Windows Azure Active Directory using SAML

Use

xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"

      

        
        
        
      

    

instead of xmlns = "urn: oasis: names: tc: SAML: 2.0: metadata"

I believe you followed what we're documenting here: http://msdn.microsoft.com/en-us/library/azure/dn195589.aspx . If so, you found a mistake in this article - sorry about that.

Hope this helps.

Gomam, I looked at your code. The problem was coding AuthnRequest. I changed it to standard deflated encoding and it worked.

public string GetAzureRequest(AuthRequestFormat format)
{
    string xml = @"<samlp:AuthnRequest xmlns=""urn:oasis:names:tc:SAML:2.0:assertion"" ID=""#ID""
                                     Version=""2.0"" IssueInstant=""#DATE""
                                     xmlns:samlp=""urn:oasis:names:tc:SAML:2.0:protocol"">
                        <Issuer xmlns=""urn:oasis:names:tc:SAML:2.0:assertion"">#ISSUER</Issuer>
                 </samlp:AuthnRequest>";

    xml = xml.Replace("#DATE", issue_instant);
    xml = xml.Replace("#ID", id);
    xml = xml.Replace("#ISSUER", appSettings.Issuer);
    xml = xml.Replace("\r\n", "");

    if (format == AuthRequestFormat.Base64)
    {
        /*COMMENTED THIS OUT*/

        //byte[] toEncodeAsBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(requestDocument.OuterXml);
        //string result = System.Convert.ToBase64String(toEncodeAsBytes);
        //return result;


        /*ADDED THIS*/

        MemoryStream memoryStream = new MemoryStream();
        StreamWriter writer = new StreamWriter(new DeflateStream(memoryStream, CompressionMode.Compress, true), new UTF8Encoding(false));
        writer.Write(xml);
        writer.Close();
        string result = Convert.ToBase64String(memoryStream.GetBuffer(), 0, (int)memoryStream.Length, Base64FormattingOptions.None);
        return result;
    }

    return null;
}