Why does my local network or shared printer not work after installing SP2?

Windows Firewall blocks network traffic unless specifically instructed otherwise. To allow the use of the local network, including file and printer sharing, it is necessary to place an Exception in the Windows Firewall for the local network.

Use the following steps to add an Exception for the local network in the Windows Firewall.

  1. From the Start menu, click Control Panel.

  2. In Control Panel, click Security Center.

  3. In the Windows Security Center window, in the Manage Security Settings For area, click Windows Firewall.

  4. In the Windows Firewall window, click the Exceptions tab, and then in the Programs and Services section, click File and Printer Sharing.