c# - Exchange WebService EWS FindAppointmens 501: Not Implemented -

we have exchange server 2010 sp2 running here on premise. i'm using ews managed api (i've tried both api/dll version 1.2 , 2.1) connect it. i'm able retrieve calendar, ews service name , version info, on line "var appointments = calendar.findappointments(calenderview);" 501 - not implement exception (see image).

i've searched net can't find info on error, nor find info on msdn. below code use:

main method:

        private void main_load(object sender, eventargs e)         {             connectwithexchange();             getcalendaritems();         } 

instantation

        /// <summary>         /// http://msdn.microsoft.com/en-us/library/office/ff597939(v=exchg.80).aspx         /// </summary>         private void connectwithexchange()         {             // 01. instantiate exchangeservice             _exchange = new exchangeservice(exchangeversion.exchange2010_sp2);              // 02. connect credentials             _exchange.usedefaultcredentials = true;             // or pass through credentials of service user:             // _exchange.credentials = new webcredentials("user@name", "password", "domain");              // 03. set correct endpoint             // http://msdn.microsoft.com/en-us/library/office/gg274410(v=exchg.80).aspx             // _exchange.url = new uri("https://outlook.kdg.be/ews/exchange.asmx");             // or use autodiscover             _exchange.autodiscoverurl("name@domain.com"); // works ok              // 04. display version , info             uxexchangeversion.text = _exchange.url.tostring(); // works ok                    } 

retrieving calendar items

        /// <summary>         /// http://msdn.microsoft.com/en-us/library/office/dn439786(v=exchg.80).aspx         /// </summary>         private void getcalendaritems()         {             // 01. init calendar folder object folder id             calendarfolder calendar = calendarfolder.bind(_exchange, wellknownfoldername.calendar, new propertyset(folderschema.displayname));              // 02. set start , end time , number of appointments retrieve             calendarview calenderview = new calendarview(datetime.now, datetime.now.adddays(7), 150);              // 03. limit properties returned             calenderview.propertyset = new propertyset(appointmentschema.subject, appointmentschema.start, appointmentschema.end);              // 04. fetch appointments             var appointments = calendar.findappointments(calenderview);             // var appointments = _exchange.findappointments(calendar.id, new calendarview(datetime.now, datetime.now.adddays(7))); // **failure point**              // 05. display appiontments in list             // 05a. fetch calender name             uxcalendername.text = calendar.displayname + " (" + calendar.id.mailbox + ")";             // 05b. fill list                         uxappointments.items.clear();             foreach (var appointment in appointments)             {                 var appointmentstring = new stringbuilder();                  appointmentstring.append("subject: " + appointment.subject.tostring() + " ");                 appointmentstring.append("start: " + appointment.start.tostring() + " ");                 appointmentstring.append("end: " + appointment.end.tostring());                  uxappointments.items.add(appointmentstring.tostring());             }         } 

i ran getcalendaritems() , works fine me. noticed don't have url redirection callback in _exchange.autodiscoverurl. i'm surprised can url without redirection.

internal static bool redirectionurlvalidationcallback(string redirectionurl) {     // default validation callback reject url.     bool result = false;      uri redirectionuri = new uri(redirectionurl);      // validate contents of redirection url. in simple validation     // callback, redirection url considered valid if using https     // encrypt authentication credentials.      if (redirectionuri.scheme == "https")     {         result = true;     }      return result; } 

can tell me target server? version of exchange targeting?