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DNS Issue?

See original GitHub issue

I’m not sure this is on your end or on the Azure end of things but my “Availability” tests in Azure has started to fail with some errors from jsDelivr recently (started yesterday). You asked me to provide the resolved IPs but it doesn’t seems like that is provided in my error.

Exception (subtype 'WebException') occured at 09/19/2018 07:33:21 (UTC) for Uri 'https://cdn.jsdelivr.net/autocomplete.js/0/autocomplete.min.js', step #1 with the error 'The remote name could not be resolved: 'cdn.jsdelivr.net'', exception text 'Microsoft.VisualStudio.TestTools.WebTesting.ConnectionFailedWebTestException: The following error occurred which may indicate you need to configure a proxy server in your Web test: The remote name could not be resolved: 'cdn.jsdelivr.net' ---> System.Net.WebException: The remote name could not be resolved: 'cdn.jsdelivr.net' at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult) at Microsoft.VisualStudio.TestTools.WebStress.WebTestTransaction.ResponseReceived(IAsyncResult result) --- End of inner exception stack trace ---', stack trace ' at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult) at Microsoft.VisualStudio.TestTools.WebStress.WebTestTransaction.ResponseReceived(IAsyncResult result)'.

I do not have much more info than this i’m afraid. I haven’t heard any complaints from users and haven’t noticed any issues myself. Maybe i should talk with Azure instead?

Issue Analytics

State:
Created 5 years ago
Comments:29 (13 by maintainers)

Top GitHub Comments

5reactions

jimaekcommented, Sep 20, 2018

I believe everything is back to normal. Right now everyone is hitting Cloudflare. It seems like the issue was with Cedexis(Citrix). They silently started failing on some routes in Europe, mostly France. It was impossible to detect because it impacted a very small amount of requests in very few locations, so none of our monitoring services detected any problems. Even those running tests from France.

I am really sorry for this issue and will try to make sure this never happens again. We were already looking into using an additional load-balancing services to complement or even replace Cedexis.

Let me know if anyone has any questions.

2reactions

jimaekcommented, Sep 19, 2018

We removed one of our DNS providers in case that was causing the issue. Let me know if that helps. Unfortunately we still have not gathered enough information to understand the problem