Webservice exception

Jeg har add'ed en webservice til mit projekt og skal nu bruge webservicens metoder..
Jeg kan godt oprette en instans af webservicen men når jeg skal kalde en metode kommer de her fejl..¨
Hva betyder fejlene?
og hvordan fixer man dem?


min exception message ser sådan ud:
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The request failed with HTTP status 407: Proxy Authentication Required ( The ISA Server requires authorization to fulfill the request. Access to the Web Proxy filter is denied.  ).

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stacktrace ser sådan ud :
------------------------------- System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
  at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
  at BRServiceInterface.WebReference.BRService.GetMessage(Int32 id) in C:\Documents and Settings\min\My Documents\BRServiceInterface\BRServiceInterface\Web References\WebReference\Reference.vb:line 223
  at BRServiceInterface.SonlincWebserviceInterface.GetMessage(Int32 id) in C:\Documents and Settings\min\My Documents\BRServiceInterface\BRServiceInterface\WebserviceInterface.vb:line 157
  at ConsoleApplication1.test.Main() in C:\Documents and Settings\min\My Documents\BRServiceInterface\ConsoleApplication1\Module1.vb:line 5
  at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
  at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
  at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
  at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
  at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
  at System.Threading.ThreadHelper.ThreadStart()