How to solve the error The remote server returned an error: (401) Unauthorized.

If you encounter an ' The remote server returned an error: (401) Unauthorized. ' error in Mail & Deploy and the Datasource affected is a Qlik Sense SaaS App, it indicates that there is a problem with the authorization.

Issue:

STACK TRACE

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()

Resolution

Check that the API Key is not expired and if so, create a new API Key and update this property in all the Qlik Sense SaaS Datasources with the new one.