Mine

[killfill@fly ~/Desktop/TrivialWS/WS1.1]$ cat WS.*
<%@ WebService Language="C#" Class="N.Hola" %>
using System.Web.Services;

namespace N
{
        public class Hola:WebService
        {
                [WebMethod]
                public string Mundo()
                {
                        return "Hola mundo";
                }
        }
}
[killfill@fly ~/Desktop/TrivialWS/WS1.1]$ mcs -t:library -r:System.Web.Services WS.cs -out:bin/WS.dll

[killfill@fly ~/Desktop/TrivialWS/WS1.1]$ xsp
xsp
Listening on port: 8080 (non-secure)
Listening on address: 0.0.0.0
Root directory: /usr/home/killfill/Desktop/TrivialWS/WS1.1
Hit Return to stop the server.


----> When i open the page in the browser, it displays this:
System.Threading.ThreadAbortException: Thread was being aborted
  at System.Web.HttpApplication+<>c__CompilerGenerated2.MoveNext () [0x00000] 
  at System.Web.HttpApplication.Tick () [0x00000] 



----> While on the console i see this:

Internal error: OutputPage threw an exception System.Threading.ThreadAbortException: Thread was being aborted

Server stack trace: 
  at Mono.WebServer.XSPRequestBroker.Close (Int32 requestId, Boolean keepAlive) [0x00000] 
  at (wrapper remoting-invoke-with-check) Mono.WebServer.XSPRequestBroker:Close (int,bool)
  at (wrapper xdomain-dispatch) Mono.WebServer.XSPRequestBroker:Close (object,byte[]&,byte[]&,int,bool)

Exception rethrown at [0]: 

  at (wrapper xdomain-invoke) Mono.WebServer.XSPRequestBroker:Close (int,bool)
  at (wrapper remoting-invoke-with-check) Mono.WebServer.XSPRequestBroker:Close (int,bool)
  at Mono.WebServer.XSPWorkerRequest.CloseConnection () [0x00000] 
  at System.Web.HttpResponse.Close () [0x00000] 
  at System.Web.HttpApplication.FinalErrorWrite (System.Web.HttpResponse response, System.String error) [0x00000] 
  at System.Web.HttpApplication.OutputPage () [0x00000] 
  at System.Web.HttpApplication.PipelineDone () [0x00000] 
System.Threading.ThreadAbortException: Thread was being aborted

Server stack trace: 
  at Mono.WebServer.BaseApplicationHost.EndOfRequest (Mono.WebServer.MonoWorkerRequest mwr) [0x00000] 
  at (wrapper delegate-invoke) System.MulticastDelegate:invoke_void_MonoWorkerRequest (Mono.WebServer.MonoWorkerRequest)
  at Mono.WebServer.MonoWorkerRequest.EndOfRequest () [0x00000] 
  at System.Web.HttpApplication.PipelineDone () [0x00000] 
  at System.Web.HttpApplication.Tick () [0x00000] 
  at System.Web.HttpApplication.Start (System.Object x) [0x00000] 
  at System.Web.HttpApplication.System.Web.IHttpAsyncHandler.BeginProcessRequest (System.Web.HttpContext context, System.AsyncCallback cb, System.Object extraData) [0x00000] 
  at System.Web.HttpRuntime.RealProcessRequest (System.Object o) [0x00000] 
  at System.Web.HttpRuntime.ProcessRequest (System.Web.HttpWorkerRequest wr) [0x00000] 
  at Mono.WebServer.MonoWorkerRequest.ProcessRequest () [0x00000] 
  at Mono.WebServer.BaseApplicationHost.ProcessRequest (Mono.WebServer.MonoWorkerRequest mwr) [0x00000] 
  at Mono.WebServer.XSPApplicationHost.ProcessRequest (Int32 reqId, Int64 localEPAddr, Int32 localEPPort, Int64 remoteEPAdds, Int32 remoteEPPort, System.String verb, System.String path, System.String queryString, System.String protocol, System.Byte[] inputBuffer, System.String redirect, IntPtr socket, Mono.WebServer.SslInformations ssl) [0x00000] 
  at (wrapper remoting-invoke-with-check) Mono.WebServer.XSPApplicationHost:ProcessRequest (int,long,int,long,int,string,string,string,string,byte[],string,intptr,Mono.WebServer.SslInformations)
  at (wrapper xdomain-dispatch) Mono.WebServer.XSPApplicationHost:ProcessRequest (object,byte[]&,byte[]&,int,long,int,long,int,string,string,string,string,byte[],string)

Exception rethrown at [0]: 

  at (wrapper xdomain-invoke) Mono.WebServer.XSPApplicationHost:ProcessRequest (int,long,int,long,int,string,string,string,string,byte[],string,intptr,Mono.WebServer.SslInformations)
  at (wrapper remoting-invoke-with-check) Mono.WebServer.XSPApplicationHost:ProcessRequest (int,long,int,long,int,string,string,string,string,byte[],string,intptr,Mono.WebServer.SslInformations)
  at Mono.WebServer.XSPWorker.RunInternal (System.Object state) [0x00000]