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Opening a Port
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Another way to create an exception for an incoming connection is to open a port. If the instructions for a program or service you want to use indicate that it needs to use a particular port, use the following procedure to open the specified port.
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1 In Windows Firewall, click the Exceptions tab. 2 Click Add Port. The Add A Port dialog box appears.
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3 In the Add A Port dialog box, make the following entries: In the Name box, type a descriptive name for the program or service. In the Port Number box, type the port number needed by the program or service. Select either TCP or UDP to match the protocol needed by the program or service. 4 Click Change Scope.
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Part 2: Keeping Your System Secure
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Part 1: Part Title
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5 In the Change Scope dialog box (see Figure 6-7 and step 4 in the previous section), select the range of computers from which you want to allow incoming connections.
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Creating Exceptions for a Server
If you run Web, FTP, or mail server software on your computer, or if you want to enable outside connections to a similar service, you need to create a firewall exception for the server. Similarly, if the server runs on another computer on your network but the network connection through which outside computers will connect to the server is on your computer, you need to create a firewall exception. Windows Firewall has exceptions defined (but not enabled) for many common server types, and you can define others. Note An exception you define on the Exceptions tab, as described in the preceding sections, applies to all network connections. Exceptions you create for a server, as described in this section, apply to a single connection. To enable a service, follow these steps:
1 In Windows Firewall, click the Advanced tab. 2 Select the network connection for which you want to allow an exception for incoming connections. 3 In the Network Connection Settings box, click Settings. The Advanced Settings dialog box appears.
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Part 2: Keeping Your System Secure
6
Microsoft Windows XP Inside Out, Second Edition
4 To use one of the predefined services, select its check box. 5 If the service is running on another computer on your network, click Edit. In the Service Settings dialog box that appears, specify the IP address of the computer hosting the service. 6 To add a service that isn t on the list of predefined services, click Add. In the Service Settings dialog box, enter the following information:
A descriptive name for the service The name or IP address of the computer hosting the service The port number that external computers will use to access the service The port number that the service is listening to on your network The protocol (TCP or UDP)
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Troubleshooting
Windows Firewall doesn t work, or it prevents connections between computers. Windows Firewall is an essential component of Windows security but because its very purpose is to isolate computers from one another, it s one that can cause problems when you try to communicate between computers. A document that you can download from the Microsoft Web site, Troubleshooting Windows Firewall in Microsoft Windows XP Service Pack 2, describes solutions to a number of common problems. To get the latest version of the document, go to http://www.microsoft.com/downloads and search for troubleshooting windows firewall.
Part 2: Keeping Your System Secure
6
Part 1: Part Title
Security Essentials
Enabling Ping and Other Diagnostic Commands
The TCP and UDP protocols are used to transmit data. But Internet communication also relies on Internet Control Message Protocol (ICMP) to communicate status, control, and error information between computers. In addition, widely used troubleshooting tools such as Ping and Tracert use ICMP to establish network connectivity. Because ICMP carries no data, it can t be used to break into your machine and steal information. But hackers do use ICMP messages for scanning networks, redirecting traffic, and carrying out Denial of Service (DoS) attacks. By default, Windows Firewall blocks most types of outgoing and incoming ICMP messages. With options accessed from the Advanced tab in Windows Firewall, you can allow certain types of ICMP packets. There s seldom a reason to enable any of these options except for troubleshooting purposes, and they can expose your computer to certain security risks. To specify ICMP settings for all connections, on the Advanced tab, click Settings in the ICMP box. A dialog box like the one shown in Figure 6-8 appears.
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