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How to Troubleshoot Connectivity Problems
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Network connectivity problems prevent any application from accessing a network resource, while application connectivity problems prevent only specific applications from accessing resources. Most network connectivity problems result from one of the following issues:
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Failed network adapter Failed network hardware Failed network connection Faulty network cables Misconfigured network hardware Misconfigured network adapter
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Application connectivity problems, however, tend to result from one of these issues (starting with the most likely):
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The remote service is not running. For example, if you re trying to remotely control a computer, Remote Desktop might not be enabled on the remote computer.
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Configuring and Troubleshooting Client Connectivity
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The remote server has a firewall configured that is blocking that application s communications from the client computer. A firewall between the client and server computer is blocking that application s communications. Windows Firewall on the local computer might be configured to block the application s traffic. The remote service has been configured to use a nondefault port number. For example, web servers typically use TCP port 80, but some administrators might configure TCP port 81 or a different port.
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The sections that follow describe how to troubleshoot network and application connectivity problems.
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How to Troubleshoot Network Connectivity Problems
To identify the source of a connectivity problem, follow these steps and answer the questions until you are directed to a different section: 1. Open Network And Sharing Center by clicking Start, clicking Network, and then clicking Network And Sharing Center. 2. If a red X is displayed over a network link, click the link to start Windows Network Diagnostics and follow the prompts that appear. If the red X is between the network and the Internet, the problem is with the Internet connection and not the local computer. Contact the network administrator for assistance. 3. If no network adapters appear, either a network adapter isn t present, the hardware has failed, or the driver is not functioning. Restart the computer. If the network adapter is still not available, use Device Manager (drvmgmt.msc) to diagnose the problem. If possible, update the driver.
Can other computers connect to the same network If not, the problem is with the network and not the computer you re troubleshooting. Contact the network administrator for assistance. Can you connect to other network resources For example, if you can browse the web but you can t connect to a shared folder, you are probably experiencing an application connectivity problem. For more information, read How to Troubleshoot Application Connectivity Problems later in this lesson.
4. Open a command prompt and run Ipconfig /all. Examine the output: 5. If the computer has an IP address in the range 169.254.0.0 through 169.254.255.255, the computer is configured to use DHCP addressing, but a DHCP server was not available. Follow the instructions in the section of this chapter entitled How to Troubleshoot an APIPA Address.
Lesson 2: Troubleshooting Network Problems
6. If you have a valid IP address but do not have a default gateway or a DNS server, the problem is caused by an invalid IP configuration. If the computer has a DHCP-assigned IP address, run ipconfig /release and ipconfig /renew from an administrative command prompt. If the computer has a manually configured IP address, obtain the correct configuration from a network administrator. 7. If no network adapters are listed, the computer either lacks a network adapter or (more likely) does not have a valid driver installed. Use Device Manager to identify the network adapter, and then install an updated driver. If the hardware has failed, replace the network adapter (or add a new network adapter if the network adapter is built in). 8. If all network adapters show a Media State of Media Disconnected, the computer is not physically connected to a network. Connect the computer to a wired or wireless network. If you are connected to a wired network and you still see this error, disconnect and reconnect both ends of the network cable. If the problem continues, replace the network cable. Attempt to connect a different computer to the same network cable; if the new computer can connect successfully, the original computer has a failed network adapter. If neither computer can connect successfully, the problem is with the network wiring, the network switch, or the network hub. Replace the network hardware as necessary. 9. If all network adapters show DHCP Enabled: No in the display of the ipconfig /all command, the network adapter might be misconfigured. If DHCP is disabled, the computer has a static IPv4 address, which is an unusual configuration for client computers. Update the network adapter IPv4 configuration to Obtain An IP Address Automatically and Obtain DNS Server Address Automatically, as described in Lesson 1, Configuring Client Networking. Then, configure the Alternate Configuration tab of the IP Properties dialog box with the current static IP configuration. 10. If you have a valid IP address and you can ping your default gateway, open a command prompt and run the command Nslookup servername. If Nslookup cannot successfully resolve a valid name and does not display an answer similar to the following, you have a name-resolution problem. See How to Troubleshoot Name Resolution Problems in this lesson.
C:\>nslookup contoso.com Non-authoritative answer: Name: contoso.com Addresses: 10.46.232.182, 10.46.130.117
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