Development environment shouldn't be enabled for deployed applications

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Development environment shouldn't be enabled for deployed applications

Shawn Mccabe 0

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Request ID: 00-d84212a0f0ecfa85b5326f4b940d2d41-8ce5b9e91288d76d-00

Development Mode

Swapping to Development environment will display more detailed information about the error that occurred.

The Development environment shouldn't be enabled for deployed applications.

It can result in displaying sensitive information from exceptions to end users.

For local debugging, enable the Development environment by setting the ASPNETCORE_ENVIRONMENT

environment variable to Development and restarting the app.

Prabhavathi Manchala 2,315 Reputation points Microsoft External Staff Moderator

2025-04-22T00:03:01.1433333+00:00
Hi Shawn Mccabe,

The app is in Development mode, which shows detailed error messages that can expose sensitive data. This is unsafe for live environments like production or staging, which is why the warning appears.

In your App Service, go to your app → select Configuration > Application settings → change ASPNETCORE_ENVIRONMENT from Development to Production → click Save and restart the app.

https://learn.microsoft.com/en-us/azure/app-service/configure-common?tabs=portal#configure-app-settings

Set ASPNETCORE_ENVIRONMENT=Production on your server like Linux or Windows and restart the app or server.

Check launchSettings.json, Program.cs, Startup.cs, and CI/CD settings to ensure they’re not overriding the environment.

For IIS deployments, update your web.config file.

<aspNetCore> <environmentVariables> <environmentVariable name="ASPNETCORE_ENVIRONMENT" value="Production" /> </environmentVariables> </aspNetCore>

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/environments?view=aspnetcore-8.0#environments
Harshitha Veeramalla 1,301 Reputation points Microsoft External Staff Moderator

2025-04-24T10:57:27.8766667+00:00

Hi Shawn Mccabe,

That is the static error message which is set in the Error.cshtml file. Remove that and publish the app.

1 answer

Your answer

Prabhavathi Manchala 2,315 Reputation points Microsoft External Staff Moderator

2025-04-22T00:03:01.1433333+00:00

Hi Shawn Mccabe,

The app is in Development mode, which shows detailed error messages that can expose sensitive data. This is unsafe for live environments like production or staging, which is why the warning appears.

In your App Service, go to your app → select Configuration > Application settings → change ASPNETCORE_ENVIRONMENT from Development to Production → click Save and restart the app.

https://learn.microsoft.com/en-us/azure/app-service/configure-common?tabs=portal#configure-app-settings

Set ASPNETCORE_ENVIRONMENT=Production on your server like Linux or Windows and restart the app or server.

Check launchSettings.json, Program.cs, Startup.cs, and CI/CD settings to ensure they’re not overriding the environment.

For IIS deployments, update your web.config file.

<aspNetCore> <environmentVariables> <environmentVariable name="ASPNETCORE_ENVIRONMENT" value="Production" /> </environmentVariables> </aspNetCore>

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/environments?view=aspnetcore-8.0#environments
Harshitha Veeramalla 1,301 Reputation points Microsoft External Staff Moderator

2025-04-24T10:57:27.8766667+00:00

Hi Shawn Mccabe,

That is the static error message which is set in the Error.cshtml file. Remove that and publish the app.

Answer 1

Harshitha Veeramalla 1,301 Microsoft External Staff Moderator

Hi Shawn Mccabe,

I have created a sample ASP.N ET Core Web app and explicitly threw a error in the controller.

public IActionResult Index()
 {
     throw new Exception("This is a test exception");
     return View();
 }

Even I got the same error initially in the error page.

enter image description here

As suggested in the message, I have set ASPNETCORE_ENVIRONMENT=Production in the Environment Variables section.

enter image description here

That is just a static content which is generated by default with the ASP.NET Core template in Views => Shared => Error.cshtml page.

enter image description here

Remove that para, save and publish the app.

enter image description here

Hope this helps

If the answer is helpful, please click Accept Answer and kindly upvote it. If you have any further questions about this answer, please click Comment.

Harshitha Veeramalla 1,301 Reputation points Microsoft External Staff Moderator

2025-04-28T04:43:25.63+00:00

Hi @Shawn Mccabe, just checking in to see if above information was helpful. If you have any further updates on this issue, please feel free to post back.
Harshitha Veeramalla 1,301 Reputation points Microsoft External Staff Moderator

2025-04-29T06:06:02.63+00:00

Hi Shawn Mccabe, just checking in to see if the provided answer helped. If this answers your query, do click "Accept the answer” for the same, which might be beneficial to other community members reading this thread. And, if you have any further queries do let us know.

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Development environment shouldn't be enabled for deployed applications

1 answer

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