Network and internet connectivity is a reoccurring problem that comes into our Helpdesk. It quickly become apparent that our techs needed a quick checklist of things they can try to restore connectivity. This list is kind of a shotgun approach to troubleshooting the issue but when time is of the essence compromises must be made. The user doesn't necessarily care why they lost connectivity; they just want it fixed - so be prepared to leave your detective skills unused in these scenarios.
- Connect wired if user is on wifi.
- Ping www.google.com
- Ipconfig – What is IP? 169.x.x.x means no obtainable IP for network card.
- Ipconfig /release + ipconfig /renew
- Ipconfig /flush DNS + ipconfig /registerdns
- Check for a static IP address configuration under network connections
- Winsock Fix: netsh winsock reset catalog (winXP)(Reboot)
- Winsock Fix: netsh winsock reset (Vista/7)(Reboot)
- netsh int ip reset (reinstalls TCP/IP)
- Check for proxy server Internet explorer/Firefox settings
- Check for bogus addons in IE/Firefox/Chrome
- Check Device manager for (!) on devices under +Network Adapters or x on Network Adapter devices. Right click : Enable if such a device exists. If an exclamation point (or question mark) exists next to the network card try right Click; remove device then scan for new hardware and reinstall
- Is the wired connection disabled due to a bad power saving setting? Check device manager for this.
- Is TCP/IP installed? If not install it (Can also try reinstalling it)
- ping 127.0.0.1 : if so : card is responding and you know hardware isn't bad
- Try a different Ethernet cable
- Check for multiple security suites running – these conflict and disrupt internet connection on occasion as well as kill performance
- Reboot into safe mode
- Try rolling back to an older restore point using System Restore
This list should either resolve or point you to the exact issue.
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