Tried to troubleshoot a problem for my nieces last night.  They have 2
computers a desktop (wired to router) and a laptop (wirelessly
connected to router).  Last night, desktop computer showed "low or no
connection" warning and my niece couldn't access the Intenet, email,
MSN Messenger, etc.  Meanwhile niece #2  kept happily surfing on the
laptop.

Clearly, problem is not on the ISP side.  To fix the desktop computer,
I ask Desktop Niece to reset the TCP/IP protocol by running the
NETSH... command.  After running this one-liner in DOS, the connection
showed CONNECTED.  However, she still couldn't load a WEB page in IE or
Firefox.  Shutting down the computer or restarting simply recreated the
problem:  no connectivity until we ran NetSH command again.

Any idea what may cause the loss of connectivity at startup and more
importantly, why she can't access the Internet  even after Network
Connections appears to be CONNECTED?  Other things we tried:  running
REPAIR, dissabling FIREWALL, changing settings by unchecking
"Autodetect Internet settings" in IE Tools-Options, unplugging and
replugging modem, router.

Suggestions and comments would be much appreciated!  Andre

Can you ping a public IP? If yes, can you ping yahoo.com? Or post the result of ipconfig /all here.

How to troubleshoot internet access issues None of the networking computers can access the Internet. ... Related Topics. Can't access the Internet via USB after enabling NIC for network ...
      www.howtonetworking.com/Internet/internetaccess0.htm 


Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
  Tried to troubleshoot a problem for my nieces last night.  They have 2
  computers a desktop (wired to router) and a laptop (wirelessly
  connected to router).  Last night, desktop computer showed "low or no
  connection" warning and my niece couldn't access the Intenet, email,
  MSN Messenger, etc.  Meanwhile niece #2  kept happily surfing on the
  laptop.

  Clearly, problem is not on the ISP side.  To fix the desktop computer,
  I ask Desktop Niece to reset the TCP/IP protocol by running the
  NETSH... command.  After running this one-liner in DOS, the connection
  showed CONNECTED.  However, she still couldn't load a WEB page in IE or
  Firefox.  Shutting down the computer or restarting simply recreated the
  problem:  no connectivity until we ran NetSH command again.

  Any idea what may cause the loss of connectivity at startup and more
  importantly, why she can't access the Internet  even after Network
  Connections appears to be CONNECTED?  Other things we tried:  running
  REPAIR, dissabling FIREWALL, changing settings by unchecking
  "Autodetect Internet settings" in IE Tools-Options, unplugging and
  replugging modem, router.

  Suggestions and comments would be much appreciated!  Andre

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