What to do if getting the error Error while copying content to a stream ?

If you get this error, review the settings of the Virtual Proxy in Qlik Sense QMC that is configured in the Datasource properties.

Issue: 

An exception occurred when trying to connect to the given Qlik Sense instance.

ADDITIONAL INFORMATION

Error while copying content to a stream.

STACK TRACE

HttpRequestException: Error while copying content to a stream.

at MailAndDeploy.Server.ExtensionMethods.Await[T](Task pTask, TimeSpan pTimeout)

at MailAndDeploy.Server.Connectors.QlikSense.QsEoWConnector.PerformAuthentication(String pLoginUrl)

at MailAndDeploy.Server.Connectors.QlikSense.QsEoWConnector.EstablishRpcConnection(Uri pUri, JsonRpcCookie[] pCookies, JsonRpcHeader[] pHeaders)

at MailAndDeploy.Server.Connectors.QlikSense.QsEoWConnector.GetAppIdentifiers()

at MailAndDeploy.Server.Services.Management.Ui.QlikSenseServerAppDatasourceSheet.ReloadAppsDropDown()

at MailAndDeploy.Server.Services.Management.Ui.QlikSenseServerAppDatasourceSheet.GeneralPage_AppField_ButtonClicked(String pSender)

IOException: Unable to read data from the transport connection: The connection was closed.

at System.Net.ConnectStream.EndRead(IAsyncResult asyncResult)

at System.Net.Http.HttpClientHandler.WebExceptionWrapperStream.EndRead(IAsyncResult asyncResult)

at System.Net.Http.StreamToStreamCopy.BufferReadCallback(IAsyncResult ar)

Resolution:

Note the Datasource's Virtual Proxy Path property and then review the settings of the Virtual Proxy in Qlik Sense QMC of the noted Proxy.

In the following example: Central Proxy (Default)

In the following example: madwin

Following the Central Proxy (Default) example, make sure Windows is set in the Windows authentication pattern property:

Similarly, the madwin example, make sure Windows is set in the Windows authentication pattern property: