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UWP server application connect from same machine fails with 127.0.0.1

1

I'm developing an UWP app which needs to be the server for a win32 client application, which is not to be changed if possible. Now the problem is I can connect to my uwp server application if I connect to the hostname or IP address of my computer. In contrast if I use localhost or 127.0.0.1 I can't get a connection.

I'm running this command constantly to enable the connection without running it, it doesn't work at all. "CheckNetIsolation.exe LoopbackExempt -is -n=Packagename"

I also executed some tests, and found out that on the computer under company IT, it only works when using the IP address. Therefore with the identical setup on a computer which is not under the companies IT, it works as expected.

So I expect there's a problem with the way my machine is configured.
We have an proxy for all outgoing connections. Another thing when I use a win32 server and client I have no problem to connect to localhost, so it seems that my machines dns configuration is in general right.

Do you have any ideas how to torubleshoot this, or what I can try to find out where my connection attempt is going. Maybe the UWP application is trying to connect over the proxy?

c# uwp localhost loopback

share|improve this question

asked Mar 7 at 11:51

MarioMario

61

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Have you tried some tool like Fiddler or WireShark? Monitor the request sent by the client.
  
  – kennyzx
  Mar 7 at 12:22
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Have you checked Internet(Client & Server) and Private Networks(Client &Server)capability?
  
  – Nico Zhu - MSFT
  Mar 8 at 3:30
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  For the "PackageName" did you use the app id? I believe it's found at "HKEY_CURRENT_USERSoftwareClassesLocal SettingsSoftwareMicrosoftWindowsCurrentVersionAppContainer". As an aside, it's my understanding also you can do this if you're planning on side loading the app but you wouldn't be able to do this in the Windows Store if deploying it there.
  
  – b.pell
  Mar 9 at 19:50
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @kennyzx I unfortunately didn't get wireshark to detect any of my interfaces, even when running as admin
  
  – Mario
  Mar 11 at 6:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @NicoZhu-MSFT Yes these capabilities are enabled
  
  – Mario
  Mar 11 at 7:00
  

  
  
  
  

 | 
show 1 more comment

1

I'm developing an UWP app which needs to be the server for a win32 client application, which is not to be changed if possible. Now the problem is I can connect to my uwp server application if I connect to the hostname or IP address of my computer. In contrast if I use localhost or 127.0.0.1 I can't get a connection.

I'm running this command constantly to enable the connection without running it, it doesn't work at all. "CheckNetIsolation.exe LoopbackExempt -is -n=Packagename"

I also executed some tests, and found out that on the computer under company IT, it only works when using the IP address. Therefore with the identical setup on a computer which is not under the companies IT, it works as expected.

So I expect there's a problem with the way my machine is configured.
We have an proxy for all outgoing connections. Another thing when I use a win32 server and client I have no problem to connect to localhost, so it seems that my machines dns configuration is in general right.

Do you have any ideas how to torubleshoot this, or what I can try to find out where my connection attempt is going. Maybe the UWP application is trying to connect over the proxy?

c# uwp localhost loopback

share|improve this question

asked Mar 7 at 11:51

MarioMario

61

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Have you tried some tool like Fiddler or WireShark? Monitor the request sent by the client.
  
  – kennyzx
  Mar 7 at 12:22
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Have you checked Internet(Client & Server) and Private Networks(Client &Server)capability?
  
  – Nico Zhu - MSFT
  Mar 8 at 3:30
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  For the "PackageName" did you use the app id? I believe it's found at "HKEY_CURRENT_USERSoftwareClassesLocal SettingsSoftwareMicrosoftWindowsCurrentVersionAppContainer". As an aside, it's my understanding also you can do this if you're planning on side loading the app but you wouldn't be able to do this in the Windows Store if deploying it there.
  
  – b.pell
  Mar 9 at 19:50
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @kennyzx I unfortunately didn't get wireshark to detect any of my interfaces, even when running as admin
  
  – Mario
  Mar 11 at 6:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @NicoZhu-MSFT Yes these capabilities are enabled
  
  – Mario
  Mar 11 at 7:00
  

  
  
  
  

 | 
show 1 more comment

I'm developing an UWP app which needs to be the server for a win32 client application, which is not to be changed if possible. Now the problem is I can connect to my uwp server application if I connect to the hostname or IP address of my computer. In contrast if I use localhost or 127.0.0.1 I can't get a connection.

I'm running this command constantly to enable the connection without running it, it doesn't work at all. "CheckNetIsolation.exe LoopbackExempt -is -n=Packagename"

I also executed some tests, and found out that on the computer under company IT, it only works when using the IP address. Therefore with the identical setup on a computer which is not under the companies IT, it works as expected.

So I expect there's a problem with the way my machine is configured.
We have an proxy for all outgoing connections. Another thing when I use a win32 server and client I have no problem to connect to localhost, so it seems that my machines dns configuration is in general right.

Do you have any ideas how to torubleshoot this, or what I can try to find out where my connection attempt is going. Maybe the UWP application is trying to connect over the proxy?

c# uwp localhost loopback

share|improve this question

asked Mar 7 at 11:51

MarioMario

61

share|improve this question

asked Mar 7 at 11:51

MarioMario

61

share|improve this question

asked Mar 7 at 11:51

MarioMario

61

asked Mar 7 at 11:51

MarioMario

61

asked Mar 7 at 11:51

MarioMario

61