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6. Click OK twice. Respond to the UAC prompt when it appears.
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The next time the user connects using the profile, Windows Vista attempts to automatically find a suitable certificate. If it cannot find one or if the user needs to insert a smart card, Windows Vista prompts the user to select a certificate, as shown in Figure 11-10.
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Figure 11-10 How Windows Vista prompts the user if a certificate cannot be automatically found
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Most mobile computers are used by only a single user. However, if mobile computers in your organization are shared among multiple users, you might want to configure wireless networks to use per-user profiles. With per-user profiles, one user can connect to a wireless network without other users being able to use the same wireless network connection. Per-user wireless profiles are important if, for example, a user configures a shared mobile computer to connect to his or her home wireless network. The default configuration of all user profiles would allow any other user of that computer to visit the original user s home and connect to the wireless network without being prompted for a security key even if the wireless network uses security. To change a wireless profile to per-user instead of all-user, follow these steps: 1. Click Start. Right-click Network, and then click Properties. The Network And Sharing Center appears. 2. In the left pane, click the Manage Wireless Networks link. The Manage Wireless Networks window appears. 3. Click Profile Types.
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Lesson 2: Advanced Wireless Configuration and Troubleshooting
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4. In the Wireless Network Profile Types dialog box, select Use All-User And Per-User Profiles, as shown in Figure 11-11.
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Figure 11-11 Using per-user wireless profiles to prevent users from sharing wireless connection configurations
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5. Click Save. When prompted, provide UAC credentials. After enabling per-user profiles, all existing wireless profiles will still be available to all users. However, the next time you connect to a new wireless network, Windows Vista will prompt you to choose how you want to store the wireless network profile, as shown in Figure 11-12. If you want to convert an existing wireless network profile from all-users to per-user, delete it and re-create it.
Figure 11-12 Windows Vista prompts you to create a new wireless network profile as per-user or all-user
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Configuring and Troubleshooting Wireless Networking
One of the unwelcome side-effects of per-user wireless profiles is that the computer is disconnected from the wireless network when a user logs off.
Troubleshooting Common Wireless Network Problems
Some of the most common wireless networking problems include the following:
Network adapter cannot see any wireless networks If your network adapter cannot see any wireless networks even though wireless networks are available, the network adapter might be turned off at the hardware level. Most mobile computers include either a dedicated hardware switch or a key combination that turns the wireless radio on or off. As shown in Figure 11-13, Windows Network Diagnostics will correctly detect this condition.
Figure 11-13 One of the most common wireless problems: a radio that has been turned off at the hardware level
You should also use Device Manager to verify that your wireless network adapter was detected and has a valid driver. To launch Device Manager, click Start, type devmgmt.msc, and press Enter. Then, expand Network Adapters. If the wireless radio is off, Windows Vista will still detect the network adapter it just won t be able to use it. n Weak wireless signal The farther you move from the wireless access point, the weaker the signal is going to be. The weaker the signal, the slower the network performance. You can, however, do several things to improve the range of a wireless signal:
Move the wireless access point away from metal cabinets, computers, or other objects that might block the wireless signals. If attempting to connect from outdoors, remove screens from windows. Screens do not block a wireless signal, but they introduce a significant amount of noise. Adjust the antenna on the wireless access point. For greatest efficiency, have someone slowly move the wireless access point antenna while a second person monitors the signal strength from a computer at the target location. Use a high-gain antenna, also known as a directional antenna. Low-gain antennas (also known as a omnidirectional antennas) broadcast in all directions relatively equally. High-gain antennas are very directional. If you need to cover a specific
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