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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://issues.shibboleth.net/jira/browse/SSPCPP" style="color: #3b73af; text-decoration: none">Shibboleth SP - C++</a> / <a href="https://issues.shibboleth.net/jira/browse/SSPCPP-733" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-b50b948b-bad1-40c5-bc55-f8319bb38c5b" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /></a> <a href="https://issues.shibboleth.net/jira/browse/SSPCPP-733" style="color: #3b73af; text-decoration: none">SSPCPP-733</a>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://issues.shibboleth.net/jira/browse/SSPCPP-733" style="color: #3b73af; text-decoration: none">Dynamic metadata should not cache negative results</a> </span>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="cantor.2@osu.edu" id="email_cantor.2@osu.edu" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=cantor.2%40osu.edu" style="color:#3b73af;; color: #3b73af; text-decoration: none">Scott Cantor</a>
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Metadata
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15/Jun/17 8:20 AM
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="bajnokk@niif.hu" id="email_bajnokk@niif.hu" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=bajnokk%40niif.hu" style="color:#3b73af;; color: #3b73af; text-decoration: none">Bajnok Kristóf</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Currently <em>minCacheDuration</em> is applied even if the metadata query failed. This makes a transient MDQ server glitch to be a 10 minute metadata error (with its default value) for all users of the given peer.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">IMO its impractical to expect 100.0% availability from the MDQ service, and users are used to hit F5 if they face error messages, but under negative caching it will not help even if the MDQ server is back up or the failing node has been kicked off by the load balancer.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I've checked only the SP:<br /> {{2017-06-15 11:55:52 ERROR OpenSAML.MetadataProvider.Dynamic <span class="error">[1]</span>: error while resolving entityID (<a href="https://idp.niif.hu/shibboleth):" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://idp.niif.hu/shibboleth):</a> CURLSOAPTransport failed while contacting SOAP endpoint (<a href="http://mdx-test.eduid.hu:8080/entities/https%3A%2F%2Fidp.niif.hu%2Fshibboleth):" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://mdx-test.eduid.hu:8080/entities/https%3A%2F%2Fidp.niif.hu%2Fshibboleth):</a> Failed to connect to mdx-test.eduid.hu port 8080: Connection timed out<br /> 2017-06-15 11:55:52 WARN OpenSAML.MetadataProvider.Dynamic <span class="error">[1]</span>: next refresh of metadata for (<a href="https://idp.niif.hu/shibboleth" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://idp.niif.hu/shibboleth</a>) no sooner than 600 seconds<br /> 2017-06-15 11:55:52 WARN Shibboleth.SessionInitiator.SAML2 <span class="error">[1]</span>: unable to locate metadata for provider (<a href="https://idp.niif.hu/shibboleth" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://idp.niif.hu/shibboleth</a>)<br /> 2017-06-15 11:56:15 WARN Shibboleth.SessionInitiator.SAML2 <span class="error">[2]</span>: unable to locate metadata for provider (<a href="https://idp.niif.hu/shibboleth" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://idp.niif.hu/shibboleth</a>)}}</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">(At the time of the second request the SP could have queried the MDQ server, but it didn't try.)</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I suggest to cache the result only if the metadata was obtained successfully.<br /> I haven't checked whether it affects the IdP or not.</p>
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