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https://www.saotn.org/iis-application-pool-recycle-on-specific-times-not-regular-time-interval/#:~:text=By%20default%2C%20an%20IIS%20application%20pool%20%28or%20%E2%80%9CAppPool%E2%80%9D%29,regular%20time%20interval%20to%20a%20specific%20time%20schedule.
https://www.saotn.org/iis-application-pool-recycle-on-specific-times-not-regular-time-interval/
By default, an IIS application pool (or “AppPool”) recycles on a regular time interval of 1740 minutes, or 29 hours. One reason for this time …
https://amanagrawal.blog/2019/09/07/iis-app-pool-recycles-will-wreck-your-long-running-background-jobs/
This had never affected us before because it had always somehow happened outside of our critical run time window. A quick internet search revealed that this is by design in IIS. IIS simply recycles the app pool in which your application runs, every 29 hours!
https://social.msdn.microsoft.com/Forums/azure/en-US/3483ad35-18c6-4fdc-84ab-6a80ea7cb44f/default-app-pool-recycle-for-azure-web-apps-how-to-change-it
Azure Web App does not have default recycle after 29 hours policy. There is no easy way to configure recycle at specific time, besides using custom Web Job to do this. As mentioned based on your scenario, You may consider using Auto Healing feature of Azure Web App, which will allow you to configure recycles at X number of requests, based on slow responses, http …
https://serverfault.com/questions/348493/why-does-the-iis-worker-process-recycle-every-29-hours-and-not-every-24-hours
Assuming your web application never has a problem and stays with in- process session state, you will want to change these defaults: 1. Turn off the 29 hour periodic recycling 2. Turn off the 20 minute idle timeout. This will prevent unexpected loss of session state.
https://weblogs.asp.net/owscott/why-is-the-iis-default-app-pool-recycle-set-to-1740-minutes
Microsoft IIS Server has what appears to be an odd default for the application pool recycle time. It defaults to 1740 minutes, which is exactly 29 hours. I’ve always been a bit curious where that default came from. If you’re like me, you may have wondered too. Wonder no longer!
https://medium.com/@ShamreshKhan/turning-off-iis-app-pool-overlap-recycle-6d2591faa312
We have a server application that when a default recycle interval (29 hours) causes the application pool to recycle, sometimes the recycled new pool does not start up.
https://www.leansentry.com/guide/reset-restart-recycle-iis/max-application-pool-warmup
We know that overlapped application pool recycling + AlwaysRunning + application warmup is a great combo strategy to keep your application always hot in production. This final section deals with the recycling timing itself. By default, IIS configures your application pool to recycle after 29 hours of uptime. But, that’s not important right now.
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