Scheduled Refresh Error

Hi,

Running 15.0.2.378 on windows 2012.  The server is configured with https to name like myservice.dev.mydomain.  

When a user tries to schedule a data refresh, they get an error.  Here is some logging.  Thanks!

2018-04-04 09:58:06.0382|INFO|11|Received request POST /api/v2.0/CacheRefreshPlans| RequestID = s_70829b83-9912-483c-9d70-a6a8003b7d9d 
2018-04-04 09:58:07.6320|ERROR|11|OData exception occurred: Microsoft.SqlServer.ReportingServices2010.RSConnection2010+MissingEndpointException: The attempt to connect to the report server failed.  Check your connection information and that the report server is a compatible version. ---> System.InvalidOperationException: Client found response content type of '', but expected 'text/xml'.
The request failed with an empty response.
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.SetConnectionProtocol()
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.SoapMethodWrapper`1.ExecuteMethod(Boolean setConnectionProtocol)
   --- End of inner exception stack trace ---
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.SoapMethodWrapper`1.ExecuteMethod(Boolean setConnectionProtocol)
   at Microsoft.SqlServer.ReportingServices2010.RSConnection2010.CreateCacheRefreshPlan(String itemPath, String description, String eventType, String matchData, ParameterValue[] parameters)
   at Microsoft.ReportingServices.Portal.Services.SoapProxy.SoapRS2010Proxy.<>c__DisplayClass32.<CreateCacheRefreshPlan>b__31()
   at Microsoft.ReportingServices.Portal.Services.SoapProxy.SoapAuthenticationHelper.ExecuteWithWindowsAuth[TReturn](SoapHttpClientProtocol soapClient, IPrincipal userPrincipal, Func`1 func)
   at Microsoft.ReportingServices.Portal.Repositories.SubscriptionService.CreateCacheRefreshPlan(IPrincipal userPrincipal, CacheRefreshPlan cacherefreshPlan)
   at Microsoft.ReportingServices.Portal.ODataWebApi.V2.Controllers.CacheRefreshPlansController.AddEntity(CacheRefreshPlan entity)
   at Microsoft.ReportingServices.Portal.ODataWebApi.Controllers.Reflection.EntitySetReflectionODataController`1.Post(ODataPath oDataPath, T value)
   at lambda_method(Closure , Object , Object[] )
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)
--- 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.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.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 System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.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 System.Web.Http.Controllers.ExceptionFilterResult.<ExecuteAsync>d__0.MoveNext().| RequestID = s_70829b83-9912-483c-9d70-a6a8003b7d9d 
2018-04-04 09:58:07.6476|INFO|6|Sending response. Response code DOMAIN\User 500, Elapsed time 0:00:01.6050009| RequestID = s_70829b83-9912-483c-9d70-a6a8003b7d9d