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Failure symptoms
Failures related to the default configuration will manifest in two ways:
●
Client applications may fail to receive data from a server. Examples include an FTP client,
multimedia streaming software, and new mail notifications in some e-mail applications.
●
Server applications running on the Windows XPe computer may not respond to client requests.
Examples include a Web server such as Internet Information Services (IIS), Remote Desktop, and
File Sharing.
NOTE: Failures in network applications are not limited to firewall issues. RPC or DCOM security
changes can cause failures. It is important to note whether the failure is accompanied by a Windows
Firewall Security Alert indicating that an application is being blocked.
Resolution
With either of the failures mentioned above, you can add exceptions to the configuration for Windows
Firewall. Exceptions configure the firewall to permit specific inbound connections to the computer.
NOTE: HP recommends adding a program instead of adding a port. Adding a program is easier and
safer than adding a port because you do not have to know which port numbers to use, and the port is
only open when the program is waiting to receive a connection. Only the specified application can use
the port, whereas opening a port allows any application to use it.
Adding a program
The recommended configuration involves adding a program to the exception list. This solution provides
the easiest configuration, as well as enables the firewall to open ranges of ports that can change each
time the program runs.
To add a program exception:
1. Open Windows Firewall and select the Exceptions tab.
2. If the program is in the list, click to enable the setting. If the program is not in the list, click Add
Program to display the Add a Program dialog box.
3. Click Browse to choose the program you wish to add as an exception, and then click OK.
4. Click Change Scope to view or set the scope for the program, and then click OK.
5. Click OK to close the Add a Program dialog box.
6. Click the check box to enable the program. By default, the program is not enabled in the list.
20 Chapter 3 Applications ENWW