Common Connectivity Problems in Visual Basic .NET

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Common Connectivity Problems
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A computer running Windows XP Home Edition cannot join a domain.
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Problems can occur with this type of network for many reasons. When troubleshooting a user s access to a domain server or resource on the network, you must verify that the user is logged on to the domain with the correct credentials and password, check the status of the servers and the physical connections, and check the status of the NIC. As with a workgroup connection, you can also try repairing and disabling and then enabling the connection from Network Connections. If you cannot resolve the problem by using any of these techniques, you will have to use more advanced troubleshooting techniques, including troubleshooting Transmission Control Protocol/Internet Protocol (TCP/IP) settings.
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Before performing any of the following troubleshooting techniques, verify that physical connections are solid, that the NIC has a green light indicating that it is functional (if the NIC has diagnostic LEDs), and that switches, routers, and other devices are working properly and are available.
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If the physical connections and hardware (including servers) are all in working order and connected properly, you can begin troubleshooting the connection s properties. You should first verify that the connection is functional and that packets are being sent and received. As with a workgroup, try repairing and then disabling and enabling the connection by following these steps: 1. Open Control Panel, and open Network Connections. Verify that the local area connection to the server is enabled, if such a connection exists. If it is not enabled, right-click the connection and choose Enable. Check to see whether this resolves the problem. 2. Right-click the local area connection for the domain if it exists, and choose Repair. (See Figure 8-8.) This connection might be a network bridge, a wireless connec tion, or another type of local area connection. Wait to see the status of the attempted repair.
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Resolving Network Configuration Issues
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Figure 8-8
Repair network connections as a first step in troubleshooting.
3. If the repair is successful, double-click the connection s icon. Verify that packets are being sent and received. Click Close. 4. If the repair procedure fails, right-click the connection and choose Disable. Rightclick again, and choose Enable. Repeat this with the network bridge if one exists. 5. If enabling is successful, double-click the Local Area Connection icon. Verify that packets are being sent and received. This denotes a healthy network connection. Click Close. 6. If the user connects to the domain over the Internet, verify that the user s Internet connection is active. If it is not, connect to the Internet before continuing. Doubleclick that connection to verify that data is being sent and received. Additionally, verify the speed, errors, and compression numbers. These might produce signifi cant hints as to the source of the connectivity problem. For instance, if the user s Internet connection speed is 28.8 Kbps, the user s requests for data will probably time out before they ever reach the server.
If a user s Internet connection is the source of the problem, you might have to troubleshoot the modem or contact the ISP for information about the problem.
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Common Connectivity Problems
If the physical connection to the server or domain is functional and packets are being sent and received or an Internet connection is working properly, verify that the user is logging on to the domain and not the computer. When a computer running Windows XP Professional is a member of a domain, users can log on to either the domain or the local computer. If a user has logged on to the computer instead of the domain, that user might not be able to access domain resources. To verify that the user is logging on to the domain, follow these steps: 1. Log off Windows XP by clicking Start, selecting Log Off, and then selecting Log Off again. 2. When you see the Welcome To Windows dialog box, press CTRL+ALT+DELETE to open the Log On To Windows dialog box. 3. In the Log On To drop-down list, make sure you select the name of the domain to which you want to log on. This list also holds an option for logging on to the local computer. 4. Enter the user s user name and password, and click OK. If the user is logging on to an incorrect domain (for instance, if the user is trying to log on using a laptop normally used for accessing the corporate domain and is now trying to use that same computer to log on to a different local domain), you have to change the computer s domain or workgroup membership on the Computer Name tab. Note that in order to do this, you must have a user account in the domain with administra tive rights to create new computer accounts in the domain. If you do not, you must have a domain administrator add the computer for you. To change the computer s domain membership, follow these steps: 1. Right-click My Computer and select Properties, or open System from Control Panel. 2. Select the Computer Name tab, and choose Change. 3. In the Computer Name Changes dialog box, shown in Figure 8-9, select Domain and type the name of the new domain. Click OK.
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