Chapter 9: Troubleshooting and Repairing Networking

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Chapter 9 Troubleshooting and Repairing
Networking
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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

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Troubleshooting Network Services at the Client

• Troubleshooting DNS
• Verify DNS Configuration
• Use nslookup.exe
• Troubleshooting DHCP
• Ipconfig.exe
• /release
• /renew

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Troubleshooting Remote Access

• VPN Connections
• Remote Desktop
• Remote Assistance

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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

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Troubleshooting Remote Desktop

• Check for firewall
• Verify general connectivity to the destination
  machine
• Is the host using NLA?

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Troubleshooting Remote Assistance

• Invitation files
• Invitation Session
• Windows Vista only session?
• Verify the Offer Remote Assistance Helpers group

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Troubleshooting Wireless Networking

• Verify settings
• SSID
• Wireless Security
• Signal Issues
• Too far from access point
• Too many walls
• Electronic Interference
• Application Log

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Troubleshooting Network Security

• Network Access Protection Issues
• DHCP-NAP
• Restricted State
• Event log errors from NAP Agent Service
• Verify Connectivity to NAP Server

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Troubleshooting Windows Firewall

• Firewall blocking incorrect apps
• Use command netsh firewall show state
  verboseenable
• Check public vs. private network

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Using the Network Connection Diagnostics Tool

• Based on the Network Diagnostics Framework
• Automatically detects common network problems
• Can often repair automatically

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Access to Network Resources

• Files and Folders
• Share permissions
• Firewall blocking
• Hidden and administrative shares
• Access to Printers
• Permissions
• Drivers
• Enable printer sharing

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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