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Igor B avatar Server

How to troubleshoot windows dotnet azure function via portal if eventlog.xml and application insight has no errors in them?

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Igor B

I upgraded my function from net core 3.1 to net 6 in code, then updated function runtime version trough portal to ~4 and net framework version trough following az command

az functionapp config set --net-framework-version v6.0 -n <APP_NAME> -g <RESOURCE_GROUP_NAME>

However when I try to access the app I getting http error 500.

  1. I tried to look at eventlog.xml and only found IIS AspNetCore Module V2 events about start and stop, no error or exception whatsoever.
  2. Also I enabled application insight and it shows no requests has being made.
  3. I restarted, redeployed binaries multiple times

The only alive activity I see is

  • Azure respond to OPTIONS with 200
  • App host seems running just fine because it shows up a homepage that tells that app is running
  • Azure is able to authorize with App Service authentication and set cookie

I understand that I can use debugger because my app still on dev environment but what I'm going to do once I hit this kind of problem on production where developer ways of figuring out the problem is not available and app is just dead in some unusual way?

Update: Forgot to mention that log streaming service shows no incoming requests as well

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