private SecureShell getDefaultJSch()
 {
     if (_defaultSecureShell == null)
     {
         _defaultSecureShell = createDefaultJSch();
         foreach (object name in _defaultSecureShell.getIdentityNames())
         {
             _byIdentityFile.put((string)name, _defaultSecureShell);
         }
     }
     return _defaultSecureShell;
 }