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I upgraded to Windows 2022 and IIS 10 from Windows 2016 and IIS 8. But after the upgrade my 2 sites are badly affected. In the evening, when the traffic on the server increases, it goes into non-responsive mode. I'm not able to find anything in event viewer and logs. When I recycle the application pool it responsive again. Please guide me how can I fix this issue.

  • Application 1 frontend based on: Angular 6
  • Application 1 webservice based on: .Net Framework 4.5.1
  • Application 2 webservice based on: .Net Framework 4.6.1 (This application consumes Apache solr that is already deployed on another server)
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  • Both of those.NET versions no longer exist, and were replaced years ago. What other information do you have? How are you measuring and monitoring performance? Commented Nov 20, 2023 at 10:23
  • devblogs.microsoft.com/dotnet/… Commented Nov 20, 2023 at 11:08
  • I would start a performance log perfmon and let that run and analyze it. Of course include the iis counters Commented Nov 20, 2023 at 13:25
  • Any customisations made to IIS for your sites? For instance within %SystemDrive%\Windows\System32\inetsrv\config? Noticed recently, unlike 20212 R2 > 2016 or 2016 > 2019, updating to 2022 resets at least some of that including any custom permissions. Commented Nov 21, 2023 at 6:15
  • In many cases, the actual OS upgrade contributed to such problems, not necessarily .NET Framework or IIS. Please use a performance profiler or hang dump analysis to determine what might be wrong and start from there. You can open a support case via support.microsoft.com if you need further assistance. Commented Nov 21, 2023 at 8:19

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