Windows 7 / Networking

Windows Network Diagnostics

Troubleshooting network problems is complicated, especially for users. Many users discover network problems when they attempt to visit a Web page with Internet Explorer. If the Web page is not available, Internet Explorer returns the message "Internet Explorer cannot display the webpage." The problem could be any one of the following, however:

  • The user mistyped the address of the Web page.
  • The Web server is not available.
  • The user's Internet connection is not available.
  • The user's LAN is not available.
  • The user's network adapter is misconfigured.
  • The user's network adapter has failed.

The cause of the problem is important for the user to understand. For example, if the Web server is not available, the user does not need to take any action-the user should simply wait for the Web server to become available. If the Internet connection has failed, the user might need to call her Internet service provider (ISP) to troubleshoot the problem. If the user's network adapter has failed, she should attempt to reset it and contact her computer manufacturer's technical support for additional assistance.

Windows Network Diagnostics and the underlying Windows Troubleshooting Platform assist users in diagnosing and, when possible, resolving network connectivity issues. When Windows 7 detects network problems, it will prompt the user to diagnose them. For example, Internet Explorer displays a link to start Windows Network Diagnostics if a Web server is unavailable, and the Network And Sharing Center will display a diagnostic link if a network is unavailable.

Applications might prompt users to open Windows Network Diagnostics in response to connectivity problems. To start Windows Network Diagnostics manually, open Network And Sharing Center, click Troubleshoot Problems, and follow the prompts that appear. Unlike many of the tools described in this tutorial, Windows Network Diagnostics is designed to be useful without a deep understanding of network technologies.

[Previous] [Contents] [Next]

In this tutorial:

  1. Troubleshooting Network Issues
  2. Tools for Troubleshooting
  3. Table-1 Network Troubleshooting Tools
  4. Arp
  5. How to Identify a Problem with the ARP Cacher
  6. How to Clear the ARP Cache
  7. Event Viewer
  8. IPConfig
  9. Nblookup
  10. Nbtstat
  11. Net
  12. How to View Shared Folders on the Local Computer
  13. How to View Shared Folders on Another Computer
  14. Netstat
  15. Network Monitor
  16. Nslookup
  17. Verifying that the Default DNS Server Resolves Correctly
  18. Verifying that a Specific DNS Server Resolves Correctly
  19. Verifying Specific Types of Addresses
  20. Using TCP for DNS Lookups
  21. PathPing
  22. PathPing Output
  23. Routing Loops
  24. Performance Problems
  25. Possible Connectivity Issues
  26. No Connectivity Issues
  27. Performance Monitor
  28. Data Collector Sets
  29. Windows Resource Monitor
  30. Ping
  31. PortQry
  32. Identifying the TCP Port for a Service
  33. Windows 7 Testing Service Connectivity
  34. Determining Available Remote Management Protocols
  35. Why PortQry Is Great
  36. Route
  37. Task Manager
  38. TCPView
  39. Telnet Client
  40. Testing Service Connectivity
  41. Test TCP
  42. Windows Network Diagnostics
  43. The Process of Troubleshooting Network Problems
  44. How to Troubleshoot Network Connectivity Problems
  45. How to Troubleshoot Application Connectivity Problems
  46. Default Port Assignments for Common Services and Tasks
  47. How to Troubleshoot Name Resolution Problems
  48. How to Verify Connectivity to a DNS Server
  49. How to Use the Hosts File
  50. How to Troubleshoot Performance Problems and Intermittent Connectivity Issues
  51. How to Troubleshoot Joining or Logging on to a Domain
  52. How to Verify Requirements for Joining a Domain
  53. How to Troubleshoot Network Discovery
  54. How to Troubleshoot File and Printer Sharing
  55. How to Troubleshoot File and Printer Sharing from the Client
  56. How to Troubleshoot File and Printer Sharing from the Server
  57. How to Troubleshoot Wireless Networks
  58. Network Diagnostics
  59. How to Troubleshoot Firewall Problems