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Suddenly App Service stopped working because of exception Could not load file or assembly 'Microsoft.ApplicationInsights' RRS feed

  • Question

  • Our Azure Web App Service in production was working fine and suddenly on 15 November exactly at 019-11-15 06:22:56.2653 we saw the app service being down due to the following error. We have not changed anything neither deployed anything new on the said app service. Wanted to know if there was any upgrade from Microsoft which caused this?

    ERROR|Stopped program because of exception Could not load file or assembly 'Microsoft.ApplicationInsights, Version=2.11.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. The system cannot find the file specified.

    Also, looking at the error we took new nuget package for appinsight and deployed and it seems to be working fine. But wanted to know what caused this and how can we prevent this in future. 

    Monday, November 18, 2019 8:18 AM

All replies

  • Hello ScalableSachin, 

    Thank you for reaching out to us. 

    There were no outages or upgrades happened during that time and I hope that the issue is resolved for you. 

    If you still see the issue happening, please feel free to send an email to AzCommunity@Microsoft.com 

    and provide the below details so we can investigate it further. 

    Subject: ATTN:Monika 

    - Provide your SubscriptionID and

    - App Name 


    Tuesday, November 19, 2019 4:00 PM
    Owner