Problem: The Windows XP Internet Connection Firewall (ICF) blocks packets sent to Sidecar running on your computer.

Solution: Manually open ports 913 and 37 in the ICF.

1. Click Start, and then click My Network Places.
2. Under Network Tasks, click View Network Connections. (Alternatively, you can right-click My Network Places and click Properties.)
3. Right-click the connection you use for the Internet and click Properties (This will most likely be named "Local Area Connection").
4. Click the Advanced tab, and then click Settings.
   NOTE: If the Settings button is unavailable, ICF is not enabled on this connection and you do not need to open any ports (they are all already open).
5. Click Add to open a new port.
6. Type a friendly name in the Description box, for example, "Sidecar : Port 37".
7. Type "127.0.0.1" in the Name or IP address of the computer hosting this service on your network box.
8. Type "37" in the External port and Internal port boxes.
9. Click TCP, and then click OK.
10. Repeat this process for port 913.

For additional information, click the article numbers below to view the articles in the Microsoft Knowledge Base:

• Q308127 How to Manually Open Ports in Internet Connection Firewall in Windows XP
• Q283673 How to Enable or Disable the Personal Firewall Feature in Windows XP
• Q307554 Programs Require Manual Port Configurations with Internet Connection Firewall