Working around the Network Loopback Isolation of UWP Apps












1















I've been hitting a blockage trying to get my UWP App to receive data from a local UDP port in the following scenario:




  • Windows 10 | Version 10.0.16299 Build 16299

  • UWP target and minimum Version 10.0.16299

  • Declared capabilities :


    • Internet (Client & Server)

    • Internet (Client)



  • UdpClient listening on 127.0.0.1:1234

  • Tested on two different systems in different networks with the same resulting behaviour




I am aware of the CheckNetIsolation tool and already tried the following steps multiple times:




  • Ensuring that the App is registered while running with CheckNetIsolation loopbackexempt -s

  • Clearing all exemptions with CheckNetIsolation loopbackexempt -c and manually adding the App with CheckNetIsolation loopbackexempt -a -n=*Package Family Name*

  • Running the App while all restrictions are cleared with CheckNetIsolation loopbackexempt -c


I am running my App from Visual Studio, awaiting for UdpClient.ReceiveAsync() to return something in a while loop.



My code works fine when i use it from a .Net Framework 4.7.2 Console App, so i can exclude any errors interfering on that end.





The only thing that lets me receive data in my UWP App is running CheckNetIsolation loopbackexempt -is -n=*Package Family Name*. As soon as i stop it from running, my UDP client stops receiving aata.





Sadly, the solution i found and other tools that redirect communication so that they appear to be sent by another source are not possible due to different contraints.










share|improve this question



























    1















    I've been hitting a blockage trying to get my UWP App to receive data from a local UDP port in the following scenario:




    • Windows 10 | Version 10.0.16299 Build 16299

    • UWP target and minimum Version 10.0.16299

    • Declared capabilities :


      • Internet (Client & Server)

      • Internet (Client)



    • UdpClient listening on 127.0.0.1:1234

    • Tested on two different systems in different networks with the same resulting behaviour




    I am aware of the CheckNetIsolation tool and already tried the following steps multiple times:




    • Ensuring that the App is registered while running with CheckNetIsolation loopbackexempt -s

    • Clearing all exemptions with CheckNetIsolation loopbackexempt -c and manually adding the App with CheckNetIsolation loopbackexempt -a -n=*Package Family Name*

    • Running the App while all restrictions are cleared with CheckNetIsolation loopbackexempt -c


    I am running my App from Visual Studio, awaiting for UdpClient.ReceiveAsync() to return something in a while loop.



    My code works fine when i use it from a .Net Framework 4.7.2 Console App, so i can exclude any errors interfering on that end.





    The only thing that lets me receive data in my UWP App is running CheckNetIsolation loopbackexempt -is -n=*Package Family Name*. As soon as i stop it from running, my UDP client stops receiving aata.





    Sadly, the solution i found and other tools that redirect communication so that they appear to be sent by another source are not possible due to different contraints.










    share|improve this question

























      1












      1








      1








      I've been hitting a blockage trying to get my UWP App to receive data from a local UDP port in the following scenario:




      • Windows 10 | Version 10.0.16299 Build 16299

      • UWP target and minimum Version 10.0.16299

      • Declared capabilities :


        • Internet (Client & Server)

        • Internet (Client)



      • UdpClient listening on 127.0.0.1:1234

      • Tested on two different systems in different networks with the same resulting behaviour




      I am aware of the CheckNetIsolation tool and already tried the following steps multiple times:




      • Ensuring that the App is registered while running with CheckNetIsolation loopbackexempt -s

      • Clearing all exemptions with CheckNetIsolation loopbackexempt -c and manually adding the App with CheckNetIsolation loopbackexempt -a -n=*Package Family Name*

      • Running the App while all restrictions are cleared with CheckNetIsolation loopbackexempt -c


      I am running my App from Visual Studio, awaiting for UdpClient.ReceiveAsync() to return something in a while loop.



      My code works fine when i use it from a .Net Framework 4.7.2 Console App, so i can exclude any errors interfering on that end.





      The only thing that lets me receive data in my UWP App is running CheckNetIsolation loopbackexempt -is -n=*Package Family Name*. As soon as i stop it from running, my UDP client stops receiving aata.





      Sadly, the solution i found and other tools that redirect communication so that they appear to be sent by another source are not possible due to different contraints.










      share|improve this question














      I've been hitting a blockage trying to get my UWP App to receive data from a local UDP port in the following scenario:




      • Windows 10 | Version 10.0.16299 Build 16299

      • UWP target and minimum Version 10.0.16299

      • Declared capabilities :


        • Internet (Client & Server)

        • Internet (Client)



      • UdpClient listening on 127.0.0.1:1234

      • Tested on two different systems in different networks with the same resulting behaviour




      I am aware of the CheckNetIsolation tool and already tried the following steps multiple times:




      • Ensuring that the App is registered while running with CheckNetIsolation loopbackexempt -s

      • Clearing all exemptions with CheckNetIsolation loopbackexempt -c and manually adding the App with CheckNetIsolation loopbackexempt -a -n=*Package Family Name*

      • Running the App while all restrictions are cleared with CheckNetIsolation loopbackexempt -c


      I am running my App from Visual Studio, awaiting for UdpClient.ReceiveAsync() to return something in a while loop.



      My code works fine when i use it from a .Net Framework 4.7.2 Console App, so i can exclude any errors interfering on that end.





      The only thing that lets me receive data in my UWP App is running CheckNetIsolation loopbackexempt -is -n=*Package Family Name*. As soon as i stop it from running, my UDP client stops receiving aata.





      Sadly, the solution i found and other tools that redirect communication so that they appear to be sent by another source are not possible due to different contraints.







      networking windows-10 udp loopback uwp






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      asked Feb 22 at 14:12









      CoresualCoresual

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