Error after deploying asp.net core app to azure

Question

After deploying my asp.net core app to azure for the first time and ran it, I got the following error:

Error. An error occurred while processing your request. Development Mode Swapping to Development environment will display more detailed information about the error that occurred.

Development environment should not be enabled in deployed applications, as it can result in sensitive information from exceptions being displayed to end users. For local debugging, development environment can be enabled by setting the ASPNETCORE_ENVIRONMENT environment variable to Development, and restarting the application.

Please note that I tried debug and release mode when publishing in visual studio and I made sure that I chose the default migration and have the connection string as well. If possible, can you tell me how to enable development mode as shown or explain the error further? Thank you

Edit: As per the suggestion I received I found the following in cloud explorer log:

Msvsmon was unable to start a server named '127.0.0.1:50867'. The following error occurred: An instance of the remote debugger is already running on this computer, or another process is already bound to the specified TCP/IP port.

1. do you get the error while deploying or after. The title doesn't really match what you write in the body 2. do you run a self-contained or portable app? Usually it takes a few days or weeks until the Azure instances get an updated version of the runtime. Considering it was released just a few days ago, chances are the runtime is not installed there yet. But if you use self-contained apps (deploy framework libraries with your application), then you don't depend on the installed framework — Tseng
– Tseng, Commented Nov 19, 2016 at 22:53
You're seeing a general error "Something went wrong and your app cant start/run properly" - you'll need to dig into the error logs a bit more to get some help with this really, you should be able to turn on the azure error logging and get something specific; could really be anything hiding behind that message. — Russell Young
– Russell Young, Commented Nov 20, 2016 at 9:15
@Tseng I have edited the questions, thanks. How do I know if I'm using portable or self contained? It's ASP.net Core app. Thanks. — Techy
– Techy, Commented Nov 20, 2016 at 12:35
@Russell I tried my best to find the error but wasn't able to find it in azure. — Techy
– Techy, Commented Nov 20, 2016 at 12:38
What do the log files say? (Cloud Explorer -> your subscription > App Services > Log Files? check that logging is enabled (web.config => stdoutLogEnabled="true) — Tseng
– Tseng, Commented Nov 20, 2016 at 12:47

Lance Larsen - Microsoft MVP · Accepted Answer · 2017-09-25 20:46:01Z

32

Just so it's clear - still something that comes up in ASP.NET Core 2.0 - and as @Techy stated - is in Azure. Go to Azure, click on your Web App –> "Applications Settings" –> go down to the “App Settings” section and add the “ASPNETCORE_ENVIRONMENT” and “Development”

answered Sep 25, 2017 at 20:46

Lance Larsen - Microsoft MVP

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William Jockusch · Accepted Answer · 2018-05-13 23:42:50Z

5

thanks for your comments. I was able to find error details by adding the following key in application settings in azure portal: ASPNETCORE_ENVIRONMENT with value: Development

I have created a new question regarding the error itself: InvalidOperationException: Could not find 'UserSecretsIdAttribute' on assembly

Thank you

edited May 13, 2018 at 23:42

William Jockusch

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answered Nov 20, 2016 at 13:52

Techy

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1 Comment

Sven van den Boogaart Over a year ago

I guess you ment ASPNETCORE_ENVIRONMENT instead of ASPNET_CORE_ENVIRONMENT

Francisco de Javier · Accepted Answer · 2019-09-20 08:49:04Z

It is a security measure used in production mode so that any user does not got sensitive exception information from our app.

You can change ASPNETCORE_ENVIRONMENT from "Production" to "Development".

Another option is to change the code for the Configure () method in Startup.cs. It is this method makes a validation:

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
        app.UseExceptionHandler("/Error");
    }

    ...
}

It is not recommended, but you can eliminate this condition:

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    app.UseDeveloperExceptionPage();
    ...
}

heman123 · Accepted Answer · 2023-06-26 15:26:10Z

0

Visually describing where you need to perform this action. I read it many times but took me time to figure out my way.

Go to configuration
New Application setting
Name : ASPNETCORE_ENVIRONMENT Value: Development

answered Jun 26, 2023 at 15:26

heman123

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