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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thanks Prashanth for the update. We were also able to work with a few other folks from umbrella to understand the root cause.
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Karthik<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Prashanth Suvarna (psuvarna) <psuvarna@cisco.com>
<br>
<b>Sent:</b> Wednesday, December 31, 2025 10:48 AM<br>
<b>To:</b> Stephane Bortzmeyer <bortzmeyer@nic.fr>; Karthikeyan Ravichandran <Karthikeyan.Ravichandran@microsoft.com><br>
<b>Cc:</b> dns-operations@dns-oarc.net<br>
<b>Subject:</b> [EXTERNAL] Re: Re: Contacts from Cisco Umbrella / OpenDNS<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<span style="font-size:9.0pt;font-family:"Segoe UI",sans-serif;color:#212121">You don't often get email from
<a href="mailto:psuvarna@cisco.com">psuvarna@cisco.com</a>. <a href="https://aka.ms/LearnAboutSenderIdentification">
Learn why this is important</a> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Hello,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">We did have an incident yesterday where OpenDNS/Cisco Umbrella DNS resolvers were not returning responses for certain domains (azure included) causing client timeouts/retries. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Incident was resolved as of 13:50 UTC on 30th December. RCA work is currently underway.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Status portal updates related to this incident is here
<a href="https://status.umbrella.cisco.com/incidents/49r2zg28sbny">https://status.umbrella.cisco.com/incidents/49r2zg28sbny</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Contains very little technical information unfortunately.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Thank you,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Prashanth<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Cisco Umbrella/OpenDNS resolver team.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">On 2025-12-30, 9:26<span style="font-family:"Arial",sans-serif"> </span>AM, "Stephane Bortzmeyer" <<a href="mailto:bortzmeyer@nic.fr">bortzmeyer@nic.fr</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">On Tue, Dec 30, 2025 at 01:50:54PM +0000,<o:p></o:p></p>
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<p class="MsoNormal">Karthikeyan Ravichandran via dns-operations <<a href="mailto:dns-operations@dns-oarc.net">dns-operations@dns-oarc.net</a>> wrote<o:p></o:p></p>
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<p class="MsoNormal">a message of 208 lines which said:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">> From Azure/Microsoft, we are seeing customers of OpenDNS being unable to resolve domains hosted on Azure DNS. Are there any contacts of folks from OpenDNS that we can work with ?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">It seems solved, no?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a href="https://status.umbrella.cisco.com/">https://status.umbrella.cisco.com/</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">"<o:p></o:p></p>
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<p class="MsoNormal">Monitoring - We identified issues and implemented a fix at 13:12 UTC.<o:p></o:p></p>
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<p class="MsoNormal">Subsequent internal checks indicate everything is working fine now. The team continues to monitor the situation closely.<o:p></o:p></p>
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<p class="MsoNormal">Dec 30, 2025 - 13:26 UTC<o:p></o:p></p>
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<p class="MsoNormal">Investigating - We are currently experiencing a service performance issue affecting multiple data centers. You may notice an increased number of fail opens and timeouts, resulting in delays or failures when making requests.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Our engineers are currently working to identify the root cause and implement a resolution. Updates will be provided as new information becomes available.<o:p></o:p></p>
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<p class="MsoNormal">Dec 30, 2025 - 12:14 UTC<o:p></o:p></p>
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<p class="MsoNormal">"<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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