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Question
Thursday, December 3, 2020 11:15 AM
Hi,
When I am connecting API (which is hosted in local system) from system android emulator using http://10.0.2.2:5500/ then it is working fine. But when I am connecting android device (through USB debugging) then it is giving an following connection error.
``` {System.Net.WebException: Error: ConnectFailure (Connection timed out) > System.Net.Sockets.SocketException: Connection timed out at System.Net.Sockets.SocketAsyncResult.CheckIfThrowDelayedException () [0x00014] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/System/System.Net.Sockets/SocketAsyncResult.cs:127 at System.Net.Sockets.Socket.EndConnect (System.IAsyncResult asyncResult) [0x0002c] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/System/System.Net.Sockets/Socket.cs:1214 at System.Net.WebConnection+<>c.b*_16*1 (System.IAsyncResult asyncResult) [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/System/System.Net/WebConnection.cs:182 at System.Threading.Tasks.TaskFactory1[TResult].FromAsyncCoreLogic (System.IAsyncResult iar, System.Func2[T,TResult] endFunction, System.Action1[T] endAction, System.Threading.Tasks.Task1[TResult] promise, System.Boolean requiresSynchronization) [0x00019] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/FutureFactory.cs:538 End of stack trace from previous location where exception was thrown
at System.Net.WebConnection.Connect (System.Net.WebOperation operation, System.Threading.CancellationToken cancellationToken) [0x00197] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/System/System.Net/WebConnection.cs:180 End of inner exception stack trace at System.Net.WebConnection.Connect (System.Net.WebOperation operation, System.Threading.CancellationToken cancellationToken) [0x0025d] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/System/System.Net/WebConnection.cs:202 at System.Net.WebConnection.InitConnection (System.Net.WebOperation operation, System.Threading.CancellationToken cancellationToken) [0x000cc] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/System/System.Net/WebConnection.cs:273 at System.Net.WebOperation.Run () [0x00052] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/System/System.Net/WebOperation.cs:268 at System.Net.WebCompletionSource1[T].WaitForCompletion () [0x0008e] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/System/System.Net/WebCompletionSource.cs:111 at System.Net.HttpWebRequest.RunWithTimeoutWorker[T] (System.Threading.Tasks.Task1[TResult] workerTask, System.Int32 timeout, System.Action abort, System.Func`1[TResult] aborted, System.Threading.CancellationTokenSource cts) [0x000e8] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/System/System.Net/HttpWebRequest.cs:956 at System.Net.HttpWebRequest.GetResponse () [0x0000f] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/System/System.Net/HttpWebRequest.cs:1218 at ASMPL.Attendance.Registration.mpgEmployeeRegistration.ddlGroupCompanySelectior () [0x0004d] in } ```
I am unable to find out where is the error.
All replies (5)
Thursday, December 3, 2020 11:47 AM
But when I am connecting android device (through USB debugging) then it is giving an following connection error Hi, ashishdhar. What the network does the physcial device connect? The API is hosted in local system, please make sure the device is using the same network as the Api.
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Thursday, December 3, 2020 12:01 PM
Hi Jarvan, My physical device is connected through USB cable. and the API is hosted in my local system.
I am surprised my other application is working fine which is connected through http://10.0.2.2:5555/ in same physical device.
Thursday, December 3, 2020 3:20 PM
Did you add the INTERNET permission in the AndroidManifest.xml? The permission is granted for the emulator by default, you need to add it when testing on the device.
Here are the related links about the issue, hope it will help you. https://stackoverflow.com/questions/37671155/system-net-webexception-error-connectfailure-connection-timed-out https://stackoverflow.com/questions/51889837/cannot-connect-to-localhost-api-from-android-app
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Friday, December 4, 2020 4:26 AM
Following permission I had already added in AndroidManifest.xml. Still same error.
<application android:label="Attendance.Android"></application> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> <uses-permission android:name="android.permission.CAMERA" /> <uses-permission android:name="android.permission.FLASHLIGHT" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.INTERNET" />
Friday, December 4, 2020 3:01 PM
other application is working fine which is connected through http://10.0.2.2:5555/ in same physical device Did you try to clean and rebuild the project? Try to add a breakpoint to check the connection code.
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