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<p style="margin: 10px 0 0 0">I looked back into yesterday's logs and something is definitely broken. The error at the IdP is logged as:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">128.146.94.52 - - [25/07/2016:12:42:41 -0400] <span class="code-quote" style="color: #009100">"GET /idp/profile/SAML2/Redirect/SSO?execution=e1s1 HTTP/1.1"</span> 200 5240 <span class="code-quote" style="color: #009100">"https:<span class="code-comment" style="color: #808080">//shibboleth.net/shibboleth-ds/index.html?entityID=https%3A%2F%2Fissues.shibboleth.net%2Fshibboleth&<span class="code-keyword" style="color: #000091; color: #009100; color: #808080">return</span>=https%3A%2F%2Fissues.shibboleth.net%2Fjira%2FShibboleth.sso%2FLogin%3FSAMLDS%3D1%26target%3Dss%253Amem%253A1d84f4f1e9e033443e6144c368dfbd6776e2af9cb954172f0642a0c5e6e5a4ae"</span> <span class="code-quote" style="color: #009100">"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:47.0) Gecko/20100101 Firefox/47.0"</span></span></pre>
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<p style="margin: 10px 0 0 0">There is no record of an access to the SP server (neither Jira nor the EDS) around that time, with that relay state.</p>
<p style="margin: 10px 0 0 0">The dispatch back from the EDS to the SP is in the Jira access log here:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">164.107.255.141 - - [25/Jul/2016:10:34:10 -0400] <span class="code-quote" style="color: #009100">"GET /jira/Shibboleth.sso/Login?SAMLDS=1&target=ss%3Amem%3A1d84f4f1e9e033443e6144c368dfbd6776e2af9cb954172f0642a0c5e6e5a4ae&entityID=urn%3Amace%3Aincommon%3Aosu.edu HTTP/1.1"</span> 302 833 <span class="code-quote" style="color: #009100">"https:<span class="code-comment" style="color: #808080">//shibboleth.net/shibboleth-ds/index.html?entityID=https%3A%2F%2Fissues.shibboleth.net%2Fshibboleth&<span class="code-keyword" style="color: #000091; color: #009100; color: #808080">return</span>=https%3A%2F%2Fissues.shibboleth.net%2Fjira%2FShibboleth.sso%2FLogin%3FSAMLDS%3D1%26target%3Dss%253Amem%253A1d84f4f1e9e033443e6144c368dfbd6776e2af9cb954172f0642a0c5e6e5a4ae"</span> <span class="code-quote" style="color: #009100">"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:47.0) Gecko/20100101 Firefox/47.0"</span></span></pre>
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<p style="margin: 10px 0 0 0">The IP address difference is just VPN. The timestamp shows that it's older. The browser is replaying the whole redirect sequence without hitting any of the servers at all.</p>
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