Can not connect to the server

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System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it 127.0.0.1:8021
at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
--- End of inner exception stack trace ---
at System.Net.HttpWebRequest.GetResponse()
at QuickTerm.ProxyBase.GetWsdl(String uri, Boolean cached) in D:\Mark\munka\kaleidoscope\quickterm\svn\branches\v5.6.2\src\QTClientCore\ProxyBase.cs:line 88
at QuickTerm.ProxyBase.GetServerIdentity(String uri, Boolean fromCache) in D:\Mark\munka\kaleidoscope\quickterm\svn\branches\v5.6.2\src\QTClientCore\ProxyBase.cs:line 111
at QTWebClient.QTService.QTManager.get_ServerIdentity() in D:\Mark\munka\kaleidoscope\quickterm\svn\branches\v5.6.2\srcweb\QTWebClient\QTService\QTManager.cs:line 710
at QTWebClient.QTService.QTManager.GetClientsOfUserForLogin(String userName, String password, Nullable`1 clientID, String& errorMessage) in D:\Mark\munka\kaleidoscope\quickterm\svn\branches\v5.6.2\srcweb\QTWebClient\QTService\QTManager.cs:line 274
at QTWebClient.QTService.QTManager.GetClientsOfUserForLogin(String userName, String password, Nullable`1 clientID) in D:\Mark\munka\kaleidoscope\quickterm\svn\branches\v5.6.2\srcweb\QTWebClient\QTService\QTManager.cs:line 266
at QTWebClient.Managers.AuthenticationManager.TryOutLoginInformationsInOrder() in D:\Mark\munka\kaleidoscope\quickterm\svn\branches\v5.6.2\srcweb\QTWebClient\Managers\AuthenticationManager.cs:line 311
at QTWebClient.Managers.AuthenticationManager.RunAuthenticationProcess() in D:\Mark\munka\kaleidoscope\quickterm\svn\branches\v5.6.2\srcweb\QTWebClient\Managers\AuthenticationManager.cs:line 136
at QTWebClient.Pages.CommonLoggedInPage.OnPreInit(EventArgs e) in D:\Mark\munka\kaleidoscope\quickterm\svn\branches\v5.6.2\srcweb\QTWebClient\Pages\CommonPage.cs:line 132
at System.Web.UI.Page.PerformPreInit()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

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