<div dir="ltr">Here's the SAML request as presented in Firefox SAML Tracer:<br><div><pre><samlp:AuthnRequest ID="_1572e46c-3744-4e8d-9969-<wbr>fe26fccc8ed1"
Version="2.0"
IssueInstant="2016-09-29T12:<wbr>36:39.342Z"
Destination="<a href="https://idp.alaska.edu/idp/profile/SAML2/Redirect/SSO" target="_blank">https://idp.<wbr>alaska.edu/idp/profile/SAML2/<wbr>Redirect/SSO</a>"
ForceAuthn="false"
IsPassive="false"
ProtocolBinding="urn:oasis:<wbr>names:tc:SAML:2.0:bindings:<wbr>HTTP-POST"
AssertionConsumerServiceURL="<a href="https://account-d.docusign.com/organizations/dc41b1e0-5bbd-4859-be88-c28699bc57d2/saml2/login" target="_blank">h<wbr>ttps://account-d.docusign.com/<wbr>organizations/dc41b1e0-5bbd-<wbr>4859-be88-c28699bc57d2/saml2/<wbr>login</a>"
xmlns:samlp="urn:oasis:names:<wbr>tc:SAML:2.0:protocol"
>
<saml:Issuer xmlns:saml="urn:oasis:names:<wbr>tc:SAML:2.0:assertion"><a href="https://account-d.docusign.com/organizations/dc41b1e0-5bbd-4859-be88-c28699bc57d2/saml2" target="_blank">https:/<wbr>/account-d.docusign.com/<wbr>organizations/dc41b1e0-5bbd-<wbr>4859-be88-c28699bc57d2/saml2</a></<wbr>saml:Issuer>
<Signature xmlns="<a href="http://www.w3.org/2000/09/xmldsig#" target="_blank">http://www.w3.org/2000/<wbr>09/xmldsig#</a>">
<SignedInfo>
<CanonicalizationMethod Algorithm="<a href="http://www.w3.org/2001/10/xml-exc-c14n#" target="_blank">http://www.w3.org/<wbr>2001/10/xml-exc-c14n#</a>" />
<SignatureMethod Algorithm="<a href="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256" target="_blank">http://www.w3.org/<wbr>2001/04/xmldsig-more#rsa-<wbr>sha256</a>" />
<Reference URI="#_1572e46c-3744-4e8d-<wbr>9969-fe26fccc8ed1">
<Transforms>
<Transform Algorithm="<a href="http://www.w3.org/2000/09/xmldsig#enveloped-signature" target="_blank">http://www.w3.org/<wbr>2000/09/xmldsig#enveloped-<wbr>signature</a>" />
<Transform Algorithm="<a href="http://www.w3.org/2001/10/xml-exc-c14n#" target="_blank">http://www.w3.org/<wbr>2001/10/xml-exc-c14n#</a>">
<InclusiveNamespaces PrefixList="#default samlp saml ds xs xsi"
xmlns="<a href="http://www.w3.org/2001/10/xml-exc-c14n#" target="_blank">http://www.w3.org/2001/<wbr>10/xml-exc-c14n#</a>"
/>
</Transform>
</Transforms>
<DigestMethod Algorithm="<a href="http://www.w3.org/2001/04/xmlenc#sha256" target="_blank">http://www.w3.org/<wbr>2001/04/xmlenc#sha256</a>" />
<DigestValue>FrP+ZC0imrgSrSK/<wbr>nzrfoDMbCx6x9TBDOrrvFZXjNh8=</<wbr>DigestValue>
</Reference>
</SignedInfo>
<SignatureValue><wbr>VOmjL1IFmt7jj55GtQ6HKhuzbUFJnd<wbr>CG5rb/+<wbr>82S7hkb7P4rFbM1rKZ419Kdmf+<wbr>vF9r6cqW+cqQ4zs63eRMwDkjM+<wbr>XJ3zr5o56iGUSkyExzTbMgjj07K5Df<wbr>RqclOpB3w6XjNRP7+Y6dv+<wbr>cNzCkUZb9cOdVijmshWwBlQfM9/<wbr>6S3MT4MTibJXbWiWzpjb7zc+<wbr>tdF6hoczciZq61rit2HTJ4/WLa+<wbr>tnZ6j6uI1X1X5ZOz4546ltuhmKEqph<wbr>+yySjun3niw6s/<wbr>iaUO6pvvhuHXmPUbE83uMmMRxaut9B<wbr>kZZ/<wbr>1pE0041p4hKrisCJbUt9Lo4iUmtCvH<wbr>1BvMx9FHttlM4rA==</<wbr>SignatureValue>
<KeyInfo>
<X509Data>
<X509Certificate><wbr>MIIG7zCCBdegAwIBAgIQaxBjH4Cjwr<wbr>c9HjjjBeW3LjANBgkqhkiG9w0BAQsF<wbr>ADB+<wbr>MQswCQYDVQQGEwJVUzEdMBsGA1UECh<wbr>MUU3ltYW50ZWMgQ29ycG9yYXRpb24x<wbr>HzAdBgNVBAsTFlN5bWFudGVjIFRydX<wbr>N0IE5ldHdvcmsxLzAtBgNVBAMTJlN5<wbr>bWFudGVjIENsYXNzIDMgU2VjdXJlIF<wbr>NlcnZlciBDQSAtIEc0MB4XDTE2MDQx<wbr>NTAwMDAwMFoXDTE5MDQxNjIzNTk1OV<wbr>owgYcxCzAJBgNVBAYTAlVTMRMwEQYD<wbr>VQQIDApXYXNoaW5ndG9uMRAwDgYDVQ<wbr>QHDAdTZWF0dGxlMRcwFQYDVQQKDA5E<wbr>b2N1U2lnbiwgSW5jLjEdMBsGA1UECw<wbr>wUVGVjaG5pY2FsIE9wZXJhdGlvbnMx<wbr>GTAXBgNVBAMMEHNzby5kb2N1c2lnbi<wbr>5jb20wggEiMA0GCSqGSIb3DQEBAQUA<wbr>A4IBDwAwggEKAoIBAQCbZJiZtWiWXH<wbr>SJcWmAzYRw/<wbr>PKfpbHQniQokolPll51jaWr+<wbr>9LU6NZ/r/xusfwb2LsJBggh+<wbr>Dp2o6IA/<wbr>4fd2DoTeJN4ubzJMoqtIiCeawid2Wg<wbr>46fCyNwcfKw/<wbr>ewU9mSY4ZmDt2pkjQseQHVz9XbZogw<wbr>UNNnxzJ+<wbr>ALRqVSPQiqzqrwJOWECehCJfj6wLYC<wbr>8aqyn2ywvlpLSK3Gsd1vym3B+<wbr>VNbVBjuXsUBQOQNzYXbDRKihKZuBCI<wbr>zKGEi6a28xj/<wbr>CTDEvbUd56vjA9fiEUf6hjLm/<wbr>Iw021b2nYgOPuQ0vuTbNP93ONiVgLr<wbr>fXuH8jqKTSg/<wbr>WAVGUtZcWat46Dsx2GVAgMBAAGjggN<wbr>dMIIDWTAbBgNVHREEFDASghBzc28uZ<wbr>G9jdXNpZ24uY29tMAkGA1UdEwQCMAA<wbr>wDgYDVR0PAQH/<wbr>BAQDAgWgMB0GA1UdJQQWMBQGCCsGAQ<wbr>UFBwMBBggrBgEFBQcDAjBhBgNVHSAE<wbr>WjBYMFYGBmeBDAECAjBMMCMGCCsGAQ<wbr>UFBwIBFhdodHRwczovL2Quc3ltY2Iu<wbr>Y29tL2NwczAlBggrBgEFBQcCAjAZDB<wbr>dodHRwczovL2Quc3ltY2IuY29tL3Jw<wbr>YTAfBgNVHSMEGDAWgBRfYM9hkFXfhE<wbr>MUimAqsvV69EMY7zArBgNVHR8EJDAi<wbr>MCCgHqAchhpodHRwOi8vc3Muc3ltY2<wbr>IuY29tL3NzLmNybDBXBggrBgEFBQcB<wbr>AQRLMEkwHwYIKwYBBQUHMAGGE2h0dH<wbr>A6Ly9zcy5zeW1jZC5jb20wJgYIKwYB<wbr>BQUHMAKGGmh0dHA6Ly9zcy5zeW1jYi<wbr>5jb20vc3MuY3J0MIIB9AYKKwYBBAHW<wbr>eQIEAgSCAeQEggHgAd4AdgDd6x0reg<wbr>1PpiCLga2BaHB+<wbr>Lo6dAdVciI09EcTNtuy+<wbr>zAAAAVQbeJIvAAAEAwBHMEUCIQC+<wbr>PhDx01YTE7+q/<wbr>kBJm7MtLDw9VajLDPpnQZjJZmk0zwI<wbr>gaK6X7/nb+<wbr>LEKFQTJP91mmD8PlAHZb+<wbr>kqmiXe53AXZlwAdgCkuQmQtBhYFIe7<wbr>E6LMZ3AKPDWYBPkb37jjd80OyA3cEA<wbr>AAAVQbeJJiAAAEAwBHMEUCIBBvAiCH<wbr>I1BIpyaEZsJg7qIhms7f6pGKY24jT8<wbr>9tDoV8AiEA9Ud3flItCDm2viIeGvbt<wbr>vfuTzXr50vGK9gf3+<wbr>Qd3rKcAdQBo9pj4H2SCvjqM7rkoHUz<wbr>8cVFdZ5PURNEKZ6y7T0/<wbr>7xAAAAVQbeJJHAAAEAwBGMEQCIHsgN<wbr>Ri2OrIb1GDmPFAMgOXcwsOWSy6XRE2<wbr>INeylW2WFAiAe9Zx1AQ8p4LkOeZSri<wbr>UVIeiZcn30GIDeKPEpMt6seSAB1AO5<wbr>Lvbd1zmC64UJpH6vhnmajD35fsHLYg<wbr>wDEe4l6qP3LAAABVBt4lCgAAAQDAEY<wbr>wRAIgW+<wbr>w2X6PYUXUeABXyC8gMObXCtO+<wbr>NqCiQyG3GPEd3J7MCIANluYVvuM1Xv<wbr>DEI1iwEzoasvs6SBXtgRxOgDzy0/<wbr>7T2MA0GCSqGSIb3DQEBCwUAA4IBAQB<wbr>SAi/C/DqUfb6yRSB2ivc08j/r/+<wbr>0By5HV76a6Vk37p8x2MAdMT2fpukOY<wbr>1K8tlCDpk49gTwe+<wbr>9bCuzFWg87Al0JtsHM9qrnLyaQF8QF<wbr>qKAWpH0yDePqQQGmxGKS/<wbr>d04MFIXuUh5QY6d4Hq6RvqR4BsAD+<wbr>sSDZ+<wbr>8rJoAsfkp1Y5xpVmJ2tB6NcwhRrsG3<wbr>cEAzqRX3n69hgLMUdMETzM+zvmOZ/<wbr>VoC+8Zj+roBtJODdqBRCNU6qnk7/<wbr>vzADLagiFTc85sLQyk3slx/tFXvD/<wbr>Vt7HD+<wbr>oBgqfiLJtyWx8YezffHdkOV86vs6HU<wbr>UeIBJAWH79o8enVs1bTCaV16wp4RNB<wbr>A</X509Certificate>
</X509Data>
</KeyInfo>
</Signature>
<samlp:NameIDPolicy Format="urn:oasis:names:tc:<wbr>SAML:1.1:nameid-format:<wbr>unspecified"
AllowCreate="true"
/>
</samlp:AuthnRequest></pre><pre>and the error in Shib IdP process log:</pre><pre><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span class="gmail-s1">04:36:39.849 - </span><span class="gmail-s2">ERROR</span><span class="gmail-s1"> [org.opensaml.ws.message.decoder.BaseMessageDecoder:208] - Encountered error parsing message into its DOM representation<br></span><span class="gmail-s1">org.opensaml.xml.parse.XMLParserException: Unable to read XML from input stream</span>
<p class="gmail-p1"><span class="gmail-s1"> at org.opensaml.xml.parse.StaticBasicParserPool.parse(StaticBasicParserPool.java:237) ~[xmltooling-1.4.0.jar:na]</span></p>...
<p class="gmail-p1"><span class="gmail-s1">Caused by: java.util.zip.ZipException: oversubscribed dynamic bit lengths tree</span></p></blockquote>
</pre></div></div>