How to solve the errors Unable to connect to the remote server and The remote server returned an error: (400) Bad Request ?

Modified on Mon, 17 Feb at 3:13 PM

FIRST CREATED ON 17 Feb 2025 I AUTHOR Emma Camacho

If getting the follow error every other time when rebuilding the cache of a Datasource or when running a task or in general, when using a Datasource, please review the version of Qlik Sense and upgrade accordingly.

Issue

WebSocketException: Unable to connect to the remote server
at MailAndDeploy.Server.ExtensionMethods.Await(Task pTask, TimeSpan pTimeout)
at MailAndDeploy.Server.Connectors.QlikSense.Rpc.RpcConnection.ConnectSocket()
at MailAndDeploy.Server.Connectors.QlikSense.Rpc.RpcConnection..ctor(IRpcConnectionInitiator pInitiator, String pUrl, RpcHeader[] pHeaders, RpcCookie[] pCookies, RpcAuthenticationMethod pAuthenticationMethod, RpcConnectionResetSettings pResetSettings)
at MailAndDeploy.Server.Connectors.QlikSense.QsConnection.CreateRpcConnection(String pUrl, RpcHeader[] pHeaders, RpcCookie[] pCookies, RpcConnectionResetSettings pResetSettings)
at MailAndDeploy.Server.Connectors.QlikSense.QsConnection.OpenApp(String pAppId, String pEngineSessionId, Boolean pOpenWithoutData)
at MailAndDeploy.Server.Connectors.QlikSense.QlikSenseAppConnector.FromDatasource(QlikSenseAppDatasource pDatasource, DatasourceImpersonationSettings pImpersonationSettings, Boolean pOpenWithoutData)
at MailAndDeploy.Server.Execution.TaskExecutionContext.GetDatasourceConnector(Datasource pDatasource, DatasourceImpersonationSettings pImpersonationSettings, Boolean pOpenWithoutData)
at MailAndDeploy.Server.Persistency.Entities.ImpersonateDatasourceConnectionAction.ExecuteAction()
at MailAndDeploy.Server.Persistency.Entities.Action.Execute()
at MailAndDeploy.Server.Persistency.Entities.Task.Execute(IEnumerable`1 pParameterValues)
WebException: The remote server returned an error: (400) Bad Request.
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

The problem you happens with the following patches:
August 2023 Patch 2
May 2023 Patch 6
February 2023 Patch 10
November 2022 Patch 12
August 2022 Patch 14
May 2022 Patch 16
February 2022 Patch 15
November 2021 Patch 17

Please install a higher patch that solves the Qlik Sense issue QB-22217.

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