Ok you all had some decent ideas... except for a few which made me
wonder if they were just random responses...

I have had the same problem with a client's computer, can connect to
LAN computers and even look them up by DNS name, but can't ping any
internet DNS names while other computers on the network could.

I tried EVERYTHING on EVERY ARTICLE ABOUT THIS.

Heres what just solved it for me:
In Local Area Connection Properties, right below Internet Protocol
Version 4 there are two other items - "Link-Layer Topology Discovery
Mapper I/O Driver" and "Link-Layer Topology Discovery Responder". I
unchecked them both, hit OK, and voila.

Had nothing to do with hardware. Vista Sucks.


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This has happened to me twice, both times after I introduced new Vista
machines onto my network. (Environment is Vista - Linksys Router -
Comcast)

I DON'T KNOW WHAT CAUSES IT, BUT I DO KNOW WHAT I DID TO FIX IT.


- Go to Device Manager
- Find the Network Adapter
- Uninstall it (but keep the drivers)
- Scan for hardware changes


The card will be "rediscovered" and magically, Internet access
returns.

Again, something got weird, and needed to be wiped out. I don't know
if this will work for you, but it worked for me.


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nezzo;4225032 Wrote:
This has happened to me twice, both times after I introduced new Vista
machines onto my network. (Environment is Vista - Linksys Router -
Comcast)

I DON'T KNOW WHAT CAUSES IT, BUT I DO KNOW WHAT I DID TO FIX IT.


- Go to Device Manager
- Find the Network Adapter
- Uninstall it (but keep the drivers)
- Scan for hardware changes


The card will be "rediscovered" and magically, Internet access
returns.

Again, something got weird, and needed to be wiped out. I don't know
if this will work for you, but it worked for me.
I also figured out that you have to disable the firewall when you do
this, or else you get an "Unknown Network" in addition to your "Private
Network". Whenever you see "Unknown Network", just know that your
Internet connection probably won't work.


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