1. Chapter 9: Troubleshooting and Repairing Networking

2. Troubleshooting Network Protocols 3 types of problems –Software: Most often a configuration problem –Physical: A failed NIC or cable –External problems: Failures of network devices such as routers Use ping.exe and tracert.exe 2

3. Troubleshooting Network Services at the Client –Troubleshooting DNS Verify DNS Configuration Use nslookup.exe –Troubleshooting DHCP Ipconfig.exe /release /renew 3

4. Troubleshooting Remote Access VPN Connections Remote Desktop Remote Assistance 4

5. Troubleshooting VPN Connections Check for Internet access Verify there is no firewall blocking VPN Verify VPN settings –Server name or address –Security settings –Network settings 5

6. Troubleshooting Remote Desktop Check for firewall Verify general connectivity to the destination machine Is the host using NLA? 6

7. Troubleshooting Remote Assistance Invitation files Invitation Session Windows Vista only session? Verify the “Offer Remote Assistance Helpers” group 7

8. Troubleshooting Wireless Networking Verify settings –SSID –Wireless Security Signal Issues –Too far from access point –Too many walls –Electronic Interference Application Log 8

9. Troubleshooting Network Security Network Access Protection Issues –DHCP-NAP –Restricted State –Event log errors from NAP Agent Service –Verify Connectivity to NAP Server 9

10. Troubleshooting Windows Firewall Firewall blocking incorrect apps Use command: netsh firewall show state verbose=enable Check public vs. private network 10

11. Using the Network Connection Diagnostics Tool Based on the Network Diagnostics Framework Automatically detects common network problems Can often repair automatically 11

12. Access to Network Resources Files and Folders –Share permissions –Firewall blocking –Hidden and administrative shares Access to Printers –Permissions –Drivers –Enable printer sharing 12

13. Configuring Network Discovery and Sharing Network and Sharing Center Based on public vs. private network profile Network Discovery allows machines to be seen LLTD allows building of network map 13