| Platform SDK: RAS/Routing and RAS | 
The RasAdminPortDisconnect function disconnects a port that is currently in use.
DWORD RasAdminPortDisconnect( const WCHAR *lpszServer, // pointer to the server name const WCHAR *lpszPort // pointer to the name of port on the server );
If the function succeeds, the return value is ERROR_SUCCESS.
If the function fails, the return value can be one of the following error codes.
| Value | Meaning | 
|---|---|
| ERROR_INVALID_PORT | The specified port is invalid. | 
| NERR_UserNotFound | The port is not currently in use. | 
There is no extended error information for this function; do not call GetLastError.
  Windows NT/2000: Requires Windows NT 4.0 or later.
  Header: Declared in Rassapi.h.
  Library: Use Rassapi.lib.
Remote Access Service (RAS) Overview, RAS Server Administration Functions