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Other wireless security guidelines
To keep the wireless network secure, follow these guidelines:
• Use a wireless password with at least 20 random characters. You can use up to 64
characters in a wireless password.
• Avoid any common words or phrases, easy sequences of characters (such as all 1s), and
personally-identifiable information for wireless passwords. Always use random strings
composed of uppercase and lowercase letters, numbers, and if allowed, special characters
such as punctuation.
• Change the default wireless password provided by the manufacturer for administrator
access to the access point or wireless router. Some routers let you change the
administrator name as well.
• Turn off administrative access over wireless if possible. If you do this, you need to connect
to the router with a wired Ethernet connection when you want to make configuration
changes.
• Turn off remote administrative access over the Internet on your router, if possible. You can
use Remote Desktop to make an encrypted connection to a computer running behind your
router and make configuration changes from the local computer you are accessing over the
Internet.
• To avoid accidentally connecting to another party's wireless network, turn off the setting to
automatically connect to non-preferred networks. This is disabled by default in Windows
XP.
Guidelines for reducing interference on a wireless network
The following tips will help reduce the chances for interference in a wireless network:
• Keep the wireless devices away from large metal objects, such as filing cabinets, and other
electromagnetic devices, such as microwaves and cordless telephones, as these objects
can disrupt radio signals.
• Keep the wireless devices away from large masonry structures and other building structures
as these objects can absorb radio waves and lower signal strength.
• Position the access point or wireless router in a central location in line of sight with the
wireless devices on the network.
• Keep all wireless devices on the network within range of one another.
Uninstall and reinstall the HP software
If your installation is incomplete, or if you connected the USB cable to the computer before
prompted by the HP software installation screen, you might need to uninstall and then reinstall the
HP software that came with the printer. Do not simply delete the printer application files from your
computer. Make sure to remove them correctly using the uninstall utility provided when you
installed the HP software.
To uninstall from a Windows computer, method 1
1. Disconnect the printer from your computer. Do not connect it to your computer until after
you have reinstalled the HP software.
2. On the computer desktop, click Start, select Programs or All Programs, click HP, click the
printer name, and then click Uninstall.
3. Follow the onscreen instructions.
4. If you are asked whether you would like to remove shared files, click No.
Other programs that use these files might not work correctly if the files are deleted.
5. Restart your computer.
6. To reinstall the HP software, insert the HP software CD into your computer's CD drive, and
follow the onscreen instructions.
7. Connect the printer when the HP software prompts you to connect it to the computer.
Appendix C
118 Network setup