CODEWITHSUNDEEP
windowsasp.net-corevisual-studio-code
Elham Kohestani
Elham Kohestani

Reputation: 3162

IO Exception in .NET Core application

I am just starting working with ASP.NET Core 2.0 on a Windows machine. I cannot run kestrel server due to the port 5000 being used by some other apps.

Exception has occurred: CLR/System.IO.IOException An unhandled exception of type 'System.IO.IOException' occurred in System.Private.CoreLib.dll: 'Failed to bind to address http://127.0.0.1:5000: address already in use.'

The issue is that I kill the process and run the dotnet run command. It works but for the second time I get the error again. So somehow I should the port should be released when I stop debugging but it doesn't. Any tips?

Upvotes: 3

Views: 15922

Answers (3)

mortb
mortb

Reputation: 9869

Try these commands in an admin command prompt:

net stop winnat
net start winnat

It will restart the service "network address Translation". The service reserves ports dynamically and once in a while it will reserve ports that collide with your application. The commands solve the problem for me most of the times, no need to change port.

Sources:

How to see what is reserving ephemeral port ranges on Windows? https://github.com/dotnet/core/issues/2001

Upvotes: 1

Gustavo
Gustavo

Reputation: 9

I had the same problem, and based on the karnveer0098 answer, I just changed the line "applicationUrl": "http://localhost:60758" inside of 'launchSettings.json', to another port number, then all came back to normal.

Upvotes: 0

karnveer0098
karnveer0098

Reputation: 9

I have faced the same. Here is the solution please refer to this:-

https://github.com/dotnet/core/issues/3110

change your port in the program.cs and launch setting.json file.

eg - : webBuilder.UseUrls("http://localhost:6980");

Upvotes: 0

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