Bedienungsanleitung HP Officejet Pro 251dw (Seite 131 von 150) (Englisch)

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NOTE: For more information about using the configuration utility, see the documentation

provided with the router or wireless access point.

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 WPA 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 an 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.

• Windows

•

Mac OS X

Windows

To uninstall — 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 on-screen instructions.

Uninstall and reinstall the HP software 127

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