Nav 2018 web client an error has occurred

The rtc is working fine on a service tier. I have created a new service tier and used new- The json file has been edited to use navuserpassword and  when the browser is run the credentials are entered but the message "An error has occurred" is displayed"

The event log shows 

Error accessing Website
Raw Url:
Url:
Type: Microsoft.Dynamics.Nav.Types.NavServerNotFoundException
Message: A server was not found at "net.tcp://nav2018demo:9046/web/Service". Either the URL is incorrect or the server is currently not available.
StackTrace:
at Microsoft.Dynamics.Nav.Client.ConnectionEstablisher.ConfirmOpenConnectionRetry(ConnectFailedEventArgs connectFailedArgs, Exception exception) in S:\Depot\NAV110\Platform\Client\Shared\Prod.Client.ServiceConnection\ConnectionEstablisher.cs:line 658
at Microsoft.Dynamics.Nav.Client.ConnectionEstablisher.OpenConnection[TChannel](ConnectFailedEventArgs connectFailedArgs, ConnectionRequest connectionRequest, ConnectionOptions connectionOptions, SpnSetting spnSettingToTry, Boolean allowSpnSettingsSwap, UserSettings& userSettings) in S:\Depot\NAV110\Platform\Client\Shared\Prod.Client.ServiceConnection\ConnectionEstablisher.cs:line 482
at Microsoft.Dynamics.Nav.Client.ConnectionEstablisher.OpenConnection[TChannel](ConnectionRequest connectionRequest, ConnectionOptions connectionOptions, UserSettings& userSettings) in S:\Depot\NAV110\Platform\Client\Shared\Prod.Client.ServiceConnection\ConnectionEstablisher.cs:line 216
at Microsoft.Dynamics.Nav.Client.Web.SimpleServerOperation.SimpleServerOperationConnectionEstablisher.OpenConnection[TChannel](ConnectionRequest connectionRequest, ConnectionOptions connectionOptions, UserSettings& userSettings) in S:\Depot\NAV110\Platform\Client\Web\Prod.Client.WebCommon\Security\SimpleServerOperation.cs:line 151
at Microsoft.Dynamics.Nav.Client.Web.SimpleServerOperation.ExecuteCore[TResult,TChannel](RequestContext requestContext, ConnectionOptions serverConnectionOptions, Func`2 operation, Func`3 operationWithContext, Func`2 localExceptionHandler) in S:\Depot\NAV110\Platform\Client\Web\Prod.Client.WebCommon\Security\SimpleServerOperation.cs:line 295
at Microsoft.Dynamics.Nav.Client.Web.SimpleServerOperation.Execute[TResult,TChannel](RequestContext requestContext, ConnectionOptions serverConnectionOptions, Func`2 operation, Func`2 localExceptionHandler) in S:\Depot\NAV110\Platform\Client\Web\Prod.Client.WebCommon\Security\SimpleServerOperation.cs:line 207
at Microsoft.Dynamics.Nav.Client.Web.UserValidator.ValidateUser(RequestContext requestContext) in S:\Depot\NAV110\Platform\Client\Web\Prod.Client.WebCommon\Security\UserValidator.cs:line 60
at Prod.Client.WebCoreApp.Authentication.UserPasswordAuthenticationProvider.<Authenticate>d__1.MoveNext()
--- 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 Microsoft.Dynamics.Nav.WebClient.Controllers.AuthenticationController.<SignIn>d__6.MoveNext()
--- 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 Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeActionMethodAsync>d__27.MoveNext()
--- 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 Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeNextActionFilterAsync>d__25.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeNextExceptionFilterAsync>d__24.MoveNext()
Source: Microsoft.Dynamics.Nav.Client.ServiceConnection----------------------------------
Type: System.Net.Sockets.SocketException
Message: An existing connection was forcibly closed by the remote host
StackTrace:
at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
at System.ServiceModel.Channels.SocketConnection.ReadCore(Byte[] buffer, Int32 offset, Int32 size, TimeSpan timeout, Boolean closing)