Consider the following scenario:

• You have a Windows Vista-based computer that is running Windows Firewall.
• A client application tries to connect through TCP port 1723.

In this scenario, Windows Vista may disconnect communications to the client. The following are examples of such client applications:

• FTP applications that connect through port 1723
• P2P applications that connect through port 1723
• Multifunction printers on which scanning or faxing options use port 1723 for communications
  Note: In this situation, no error message is displayed in Windows. However, an error is displayed on the printer.