How to solve the error WebException: The remote server returned an error: (401) Unauthorized?
FIRST CREATED ON 24 Oct 2025 I AUTHOR Emma Camacho
If getting the following error every time when rebuilding the cache of a Datasource, creating the preview of a Report or when running a task, please review the API Key used in the Datasource definition as this error suggests the API key expired.
Issue
WebSocketException: Unable to connect to the remote server
at MailAndDeploy.Server.ExtensionMethods.Await(Task pTask, TimeSpan pTimeout)
at MailAndDeploy.Server.Json.Rpc.JsonRpcConnection..ctor(Uri pUri, JsonRpcCookie[] pCookies, JsonRpcHeader[] pHeaders)
at MailAndDeploy.Server.Connectors.QlikSense.QsSaasConnector.EstablishRpcConnection(Uri pUri, JsonRpcCookie[] pCookies, JsonRpcHeader[] pHeaders)
at MailAndDeploy.Server.Connectors.QlikSense.QsSaasConnector.EstablishRpcConnection(String pAppId, String& pEngineSessionId)
at MailAndDeploy.Server.Connectors.QlikSense.Model.QsApp.EstablishRpcConnection()
at MailAndDeploy.Server.Connectors.QlikSense.Model.QsApp..ctor(QsConnector pConnector, String pAppId)
at MailAndDeploy.Server.Connectors.QlikSense.QsConnector.OpenApp(QlikSenseAppDatasource pDatasource, UserIdentity pIdentity)
at MailAndDeploy.Server.Persistency.Entities.Datasource.RebuildCache()
at MailAndDeploy.Server.Services.Management.Ui.DatasourcesSheet.ListPage_EntitiesTable_CellButtonClicked(String pSender, String pData)
WebException: The remote server returned an error: (401) Unauthorized.
at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Net.WebSockets.ClientWebSocket.d__21.MoveNext()
at MailAndDeploy.Server.ExtensionMethods.Await(Task pTask, TimeSpan pTimeout)
at MailAndDeploy.Server.Json.Rpc.JsonRpcConnection..ctor(Uri pUri, JsonRpcCookie[] pCookies, JsonRpcHeader[] pHeaders)
at MailAndDeploy.Server.Connectors.QlikSense.QsSaasConnector.EstablishRpcConnection(Uri pUri, JsonRpcCookie[] pCookies, JsonRpcHeader[] pHeaders)
at MailAndDeploy.Server.Connectors.QlikSense.QsSaasConnector.EstablishRpcConnection(String pAppId, String& pEngineSessionId)
at MailAndDeploy.Server.Connectors.QlikSense.Model.QsApp.EstablishRpcConnection()
at MailAndDeploy.Server.Connectors.QlikSense.Model.QsApp..ctor(QsConnector pConnector, String pAppId)
at MailAndDeploy.Server.Connectors.QlikSense.QsConnector.OpenApp(QlikSenseAppDatasource pDatasource, UserIdentity pIdentity)
at MailAndDeploy.Server.Persistency.Entities.Datasource.RebuildCache()
at MailAndDeploy.Server.Services.Management.Ui.DatasourcesSheet.ListPage_EntitiesTable_CellButtonClicked(String pSender, String pData)
WebException: The remote server returned an error: (401) Unauthorized.
at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Net.WebSockets.ClientWebSocket.d__21.MoveNext()
Resolution
Update the API Key used in the Datasource definition as this error suggests the API Key expired.
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