Azure App Service
Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
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.net Web App recycles every 10 minutes unless fcnMode set to disabled in Web.Config
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Michael Fitzback
0
Reputation points
Starting on Tuesday 5/6/2025 at 3:13ET my Azure hosted (US East) .net web app recycles every 5-10 minutes. It is not consistent. There were no code changes at this time. There are no file changes in wwwroot. The only way to get it to stop recycling is set fcnMode="Disabled" in web.config.
Azure App Service
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Siva Nair 1,485 Reputation points Microsoft External Staff Moderator2025-05-08T21:12:34.06+00:00 Hi Michael Fitzback,
Lets follow few troubleshooting steps below:
- Look into your application pool's recycling settings. The default configuration in IIS can recycle the app due to memory limits, request limits, or time intervals. You might want to adjust the
memory,privateMemory, orrequestsattributes in yourrecycling/periodicRestartsettings if they're set too low. - Sometimes, changes to the
web.configfile are treated as a signal to recycle the app. Double-check that no settings have been changed that could prompt this behavior. - ASP.NET can recycle the application domains for various reasons including memory pressure or configuration changes. Ensure that your app isn't facing memory allocation failures or other high-memory conditions, which could trigger unplanned recycle operations.
- As a default, periodic restarts are scheduled for app pools for health. If your application isn't designed to handle this gracefully, it might be causing issues.
- Review your application for large objects or sessions being held in memory longer than necessary. This might help with the recycling frequency.
applicationpools/add/recycling/
recycling/periodicrestart/schedule/add
If you have any further assistant, do let me know.
- Look into your application pool's recycling settings. The default configuration in IIS can recycle the app due to memory limits, request limits, or time intervals. You might want to adjust the
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Sirra Sneha 550 Reputation points Microsoft External Staff Moderator2025-05-12T08:02:19.7233333+00:00 Hi @Michael Fitzback,
There are any entries in App Service Diagnostics related to memory pressure, file change notifications, or restarts?
Any background processes or extensions in your app might be writing to the file system (even temp files)?
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Sirra Sneha 550 Reputation points Microsoft External Staff Moderator
2025-05-13T10:40:33.1566667+00:00 Hi @Michael Fitzback ,
We haven't heard any response from you, If you have any further updates on this issue, please feel free to post back.
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