An app service plan moved around among different instances

Question

An app service plan moved around among different instances

Markus Jansson 0

Hi,

One of our app service plans have been moved around to different instances during the last couple of days, resulting in performance issues and weird behaviour to some apps in the plan. The plan itself is not scaled out so it should use just one instance. But using the CPU drilldown there are different instances in the dropdown and all of the apps seem to have been moved between them several times the last days.

This also have had the very weird consequence that one of our web services is not reachable by a specific external source, but reachable by others. Something that we are investigating now.

But the main question here is, why are the apps moving around on different instances when there should be only one instance on the plan, and why is this affecting the performance?

I can provide you with specific details about which app service plan this regards in a private conversation if you wish.

Regards,

Markus

Michele Ariis 165 Reputation points MVP

2025-05-08T13:55:04.86+00:00

Hi Markus, even with a single “instance” Azure can move your apps between physical hosts for maintenance, patching or balancing. Each swap leaks cache in memory and can change the outgoing IP, resulting in slowdowns and reachability issues for some clients.

What to do right away

Open a Microsoft ticket indicating your App Service Plan.

Turn on diagnostic logs (Application Insights) to see when the shifts occur.

If you need absolute stability, consider an App Service Environment (ASE) or an Isolated plan.
Alekhya Vaddepally 915 Reputation points Microsoft External Staff Moderator

2025-05-09T00:17:46.3833333+00:00

Hi Markus Jansson,

Just checking in to see if the above answer provided by Michele Ariis helped.

In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
Markus Jansson 0 Reputation points

2025-05-09T06:21:29.1933333+00:00

Hi Michele,

Thank you for your answer. Are you saying there is still a way to open a Microsoft ticket to discuss a specific app service plan (or some other resource of ours)? Where do I do that, I can't find it in help & support in the Azure portal anymore?

Regards,

Markus
Alekhya Vaddepally 915 Reputation points Microsoft External Staff Moderator

2025-05-09T18:28:46.6833333+00:00

Hi Markus Jansson
Please follow the below link to create a support ticket , let me know if you face any issue on that
https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request
Prabhavathi Manchala 1,055 Reputation points Microsoft External Staff Moderator

2025-05-12T05:20:56.12+00:00

Hi Markus Jansson,

Just checking in to see if you were able to follow the steps in the link Alekhya shared earlier to create a support ticket. If you have any further updates on this issue, please feel free to post back.

1 answer

Your answer

Michele Ariis 165 Reputation points MVP

2025-05-08T13:55:04.86+00:00

Hi Markus, even with a single “instance” Azure can move your apps between physical hosts for maintenance, patching or balancing. Each swap leaks cache in memory and can change the outgoing IP, resulting in slowdowns and reachability issues for some clients.

What to do right away

Open a Microsoft ticket indicating your App Service Plan.

Turn on diagnostic logs (Application Insights) to see when the shifts occur.

If you need absolute stability, consider an App Service Environment (ASE) or an Isolated plan.
Alekhya Vaddepally 915 Reputation points Microsoft External Staff Moderator

2025-05-09T00:17:46.3833333+00:00

Hi Markus Jansson,

Just checking in to see if the above answer provided by Michele Ariis helped.

In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
Markus Jansson 0 Reputation points

2025-05-09T06:21:29.1933333+00:00

Hi Michele,

Thank you for your answer. Are you saying there is still a way to open a Microsoft ticket to discuss a specific app service plan (or some other resource of ours)? Where do I do that, I can't find it in help & support in the Azure portal anymore?

Regards,

Markus
Alekhya Vaddepally 915 Reputation points Microsoft External Staff Moderator

2025-05-09T18:28:46.6833333+00:00

Hi Markus Jansson
Please follow the below link to create a support ticket , let me know if you face any issue on that
https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request
Prabhavathi Manchala 1,055 Reputation points Microsoft External Staff Moderator

2025-05-12T05:20:56.12+00:00

Hi Markus Jansson,

Just checking in to see if you were able to follow the steps in the link Alekhya shared earlier to create a support ticket. If you have any further updates on this issue, please feel free to post back.

Answer 1

Markus Jansson 0

Hi,

Where exactly can I create a support ticket? I don't think the information on the page you provided is up-to-date, as there seems to be no way of actually creating a support ticket anymore. The only option seems to be to raise the question here in the Microsoft Q&A, and since these questions are public I don't know how to get help with a specific resource of ours.

Regards,

Markus

Bodapati Harish 400 Reputation points Microsoft External Staff Moderator

2025-05-12T15:25:43.0633333+00:00
Hello Markus Jansson,

Thank you for the update. I understand your concern regarding the inability to find the support ticket option in the Azure portal.

To raise a private support request for your specific App Service Plan.

In the Azure Portal, go to Help + support.

Click on + Create a support request.

Follow the guided steps to select the App Service resource and specify the issue.

If you don’t see the "Create a support request" option, it might be due to subscription-level restrictions (e.g., your subscription might not have a support plan enabled). In such a case, you can check with your subscription admin or view this page to understand the available support plans.

Sharing this kind of issue privately with the support team will allow deeper diagnostics and resolution. Also, feel free to share any updates here (as long as they’re non-sensitive) to help others facing similar issues.

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An app service plan moved around among different instances

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