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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">We are currently running Shibboleth Identity Provider 3.4.6 and use it for servicing the logons to over a dozen systems.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Just over a week ago one of those systems, a moodle based system, stopped being able to logon with the message displayed;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Web Login Service - Unable to Respond<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">The login service was unable to identify a compatible way to respond to the requested application. This is generally to due to a misconfiguration on the part of the application and should be
reported to the application's support team or owner.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">and from the logs;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">2020-04-10 10:54:10,381 - WARN [net.shibboleth.idp.saml.profile.impl.PopulateBindingAndEndpointContexts:410] - Profile Action PopulateBindingAndEndpointContexts: Unable to resolve outbound message
endpoint for relying party 'https://engage.elearning.sruc.ac.uk': EndpointCriterion [type={urn:oasis:names:tc:SAML:2.0:metadata}AssertionConsumerService, Binding=urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST, Location=https://engage.elearning.sruc.ac.uk/Shibboleth.sso/SAML2/POST,
trusted=false]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">2020-04-10 10:54:10,381 - WARN [org.opensaml.profile.action.impl.LogEvent:105] - A non-proceed event occurred while processing the request: EndpointResolutionFailed<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">All of the other systems that we connect to that use this IDP are still functioning correctly and nothing in the configuration on this server has changed as we restored the VM for it from the
time when it was working and it displayed the same behaviour.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">The system we are connecting to is a moodle instance that is hosted by a 3rd party for us. They host a number of other moodle instances as well all of which are still functioning normally and
they say that nothing has changed at their end either.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Looking at the metadata for the SP it appears to be the same before and after it stopped working and DNS all appears in order.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Does anyone have any suggestions as to how we should investigate this issue and track down the problem?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Thanks in advance.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Peter<o:p></o:p></span></p>
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<p class="MsoNormal"><font face="Arial" size="2"><span style="FONT-SIZE: 8pt; FONT-FAMILY: Arial">SRUC
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A Charitable company limited by guarantee, Scottish Charity Number: SC003712. <br>
Registered in Scotland, Company Number: SC103046 - Registered Office: Peter Wilson Building, King’s Buildings, West Mains Road, Edinburgh EH9 3JG
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