Sudden drop in incoming network traffic for Cloud Service (extended support)

hnnsj 46 Reputation points
2023-11-15T13:47:04.94+00:00

I have two swappable Cloud Services (extended support) which run an IoT Gateway. Early this morning, incoming traffic suddenly dropped on the service that acts as the production server. No deploys were made in connection to this. We noticed that our IoT devices no longer could connect to the service.

When we swapped in the other service (a backup), we noticed that they would not connect to that service either and there was no production-level incoming traffic on that service either. After restarting the service, the traffic resumed. Restarting the other service and swapping it back in, network traffic was coming in as normal on that one as well. We can see no explanation for this. The event log shows nothing, CPU and memory metrics look normal, there are no odd traces in Application Insights (which we use to collect logs) at the time. Requests simply stop arriving.

It has been running for multiple years without running into a similar issue.

Azure Cloud Services
Azure Cloud Services
An Azure platform as a service offer that is used to deploy web and cloud applications.
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Accepted answer
  1. kobulloc-MSFT 25,961 Reputation points Microsoft Employee
    2023-11-15T18:00:17.1366667+00:00

    Hello, @hnnsj !

    Why has there been a sudden drop with incoming network traffic for Cloud Service (extended support)?

    Looking at your troubleshooting steps so far:

    • Configuration has been running for multiple years without running into a similar issue: There are no recent changes or deployments from your end that would have caused this.
    • Tested with multiple services: Seeing identical results on both services suggests that this is not an intermittent issue.
    • Event logs and Application Insights: Nothing stands out in the logs or telemetry as a possible cause.
    • Restarting the service resolves the problem: Suggests this is a service related issue.

    Given that, it looks like we need to determine where the service level issue is occurring. To do this, we'll need to take a closer look at your resources. Please email the following to AzCommunity@microsoft.com and we'll get back to you promptly:

    • Subject: "Attn: kobulloc - Cloud Services with IoT Gateway"
    • Email body: Your Subscription ID
    • Email body: A link to this thread so we can validate and expedite the request

    If you don't receive a response within 24 hours, please reply to the thread so we can investigate.

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