Reproduce error with EWS on mono

Dockerfile

FROM mono:onbuild
CMD [ "mono",  "./ewsTest.exe" ]

Program.cs

using Microsoft.Exchange.WebServices.Data;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace ewsManageedTest
{
    class Program
    {
        static void Main(string[] args)
        {
            ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP2);
            service.Url = new Uri("");
            service.Credentials = new WebCredentials("", "");
            var subscription = service.SubscribeToStreamingNotifications(
                new FolderId[] {new FolderId(WellKnownFolderName.Calendar, "")}, 
                EventType.Created,
                EventType.Deleted, 
                EventType.Modified
            );

            service.TraceListener = new Tracer();
            service.TraceFlags = TraceFlags.EwsResponse | TraceFlags.EwsRequest;
            service.TraceEnabled = true;

            StreamingSubscriptionConnection conn = new StreamingSubscriptionConnection(service, 10);
            conn.AddSubscription(subscription);
            conn.OnDisconnect += conn_OnDisconnect;
            conn.OnNotificationEvent += conn_OnNotificationEvent;
            conn.OnSubscriptionError += conn_OnSubscriptionError;
            conn.Open();

            Thread.Sleep(TimeSpan.FromHours(1));
        }

        static void conn_OnSubscriptionError(object sender, SubscriptionErrorEventArgs args)
        {
            
        }

        static void conn_OnNotificationEvent(object sender, NotificationEventArgs args)
        {
            
        }

        static void conn_OnDisconnect(object sender, SubscriptionErrorEventArgs args)
        {
            if (args.Exception != null)
                throw args.Exception;
        }
    }

    class Tracer : ITraceListener
    {

        public void Trace(string traceType, string traceMessage)
        {
            Console.WriteLine(" [ T ] type: {0} \n {1} ", traceType, traceMessage);
        }
    }
}

Tried this against a Exchange 2013 box I have. Running as a test within Visual Studio.
Requested 2010_SP2 mode from the server as in your code.
Seems to work just fine, no problem.

Maybe a mono-specific problem.

Response message:

<Trace Tag="EwsResponse" Tid="4" Time="2015-07-17 18:44:19Z" Version="0.0.0.0">
  <Envelope xmlns="http://schemas.xmlsoap.org/soap/envelope/">
    <soap11:Header xmlns:soap11="http://schemas.xmlsoap.org/soap/envelope/">
      <ServerVersionInfo xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" MajorVersion="15" MinorVersion="0" MajorBuildNumber="775" MinorBuildNumber="35" Version="V2_4" xmlns="http://schemas.microsoft.com/exchange/services/2006/types" />
    </soap11:Header>
    <soap11:Body xmlns:soap11="http://schemas.xmlsoap.org/soap/envelope/">
      <m:GetStreamingEventsResponse xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages">
        <m:ResponseMessages>
          <m:GetStreamingEventsResponseMessage ResponseClass="Success">
            <m:ResponseCode>NoError</m:ResponseCode>
            <m:ConnectionStatus>OK</m:ConnectionStatus>
          </m:GetStreamingEventsResponseMessage>
        </m:ResponseMessages>
      </m:GetStreamingEventsResponse>
    </soap11:Body>
  </Envelope>
</Trace>

<Trace Tag="EwsResponse" Tid="5" Time="2015-07-17 18:44:19Z" Version="0.0.0.0">
  <?xml version="1.0" encoding="utf-8"?>
  <s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
    <s:Header>
      <h:ServerVersionInfo MajorVersion="15" MinorVersion="0" MajorBuildNumber="775" MinorBuildNumber="35" Version="V2_4" xmlns:h="http://schemas.microsoft.com/exchange/services/2006/types" xmlns="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" />
    </s:Header>
    <s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <m:SubscribeResponse xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
        <m:ResponseMessages>
          <m:SubscribeResponseMessage ResponseClass="Success">
            <m:ResponseCode>NoError</m:ResponseCode>
            <m:SubscriptionId>FgBpc3Rlc3QtZXhjaC0wMi5sYWIyLmFkEAAAABuwHn9qVLdHp6OeqjbWzjcZAE2M147SCA==</m:SubscriptionId>
          </m:SubscribeResponseMessage>
        </m:ResponseMessages>
      </m:SubscribeResponse>
    </s:Body>
  </s:Envelope>
</Trace>

Downloaded latest mono release on windows and created a console program, ran it in the mono command prompt, still works fine. I'm now more inclined to think that something has been fixed between Exchange 2010 SP2 and Exchange 2013, since I can't replicate the error.