local area connection doesn't have a valid IP configuration in windows 7

firefly11
firefly11 used Ask the Experts™
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Hi, I just bought a new ASUS laptop but it wouldn't connect to internet via ethernet cable. Internet works fine on my other XP laptop but not on this one. I tried troubleshooting and this is the message I get: "local area connection doesn't have a valid ip configuration". I tried rebooting, disabling/enabling network adapters and other things i read online but nothing seems to fix the problem. Please help this is really frustrating. Thanks.
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It could be a firewall issue. Do you have McAfee installed on that laptop?
1) Check the cable... make sure it is functioning properly.
2) What are you connecting to? (e.g. a cable modem, router, hub, etc.?)

It sounds like it is not seeing a DHCP server on the connection.

Make sure the settings for the adapter are correct (i.e. use DHCP)...

Another possibility (if older equipment) is that your infrastructure is not IPV6 compatible...   In the adapter properties, try UNCHECKING the IPV6 protocol.

Finally, it may be that you have a defective ethernet port on the new machine, and you may need it replaced/repaired under warranty.  If this is not an option, there are inexpensive USB to ethernet adapters as well as PC card solutions that can be added rather than an expensive motherboard repair!
I had a similar issue with windows 7 where the network would not work until a did a complete system reload. (on a Dell Studio Laptop)
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Commented:
Can you post the results of your IP config on the XP machine?

Go to Start > Run > Type cmd and hit enter.  Then type  ipconfig /all  at the prompt.  

This will give IP info for all your network adapters.  It should be the info near the top.  Then we need to compare that info with the Windows 7 machine.  It could be that static IP info will have to be entered in the current adapter before it will be able to 'Obtain Automatically' via DHCP

Author

Commented:
Windows IP Configuration

        Host Name . . . . . . . . . . . . : D6MNZQM1
        Primary Dns Suffix  . . . . . . . :
        Node Type . . . . . . . . . . . . : Hybrid
        IP Routing Enabled. . . . . . . . : No
        WINS Proxy Enabled. . . . . . . . : No
        DNS Suffix Search List. . . . . . : hsd1.wv.comcast.net.

Ethernet adapter Wireless Network Connection:

        Media State . . . . . . . . . . . : Media disconnected
        Description . . . . . . . . . . . : Dell Wireless 1397 WLAN Mini-Card
        Physical Address. . . . . . . . . : 70-F1-A1-7A-ED-88

Ethernet adapter Local Area Connection:

        Connection-specific DNS Suffix  . : hsd1.wv.comcast.net.
        Description . . . . . . . . . . . : Realtek RTL8102E/RTL8103E Family PC
-E Fast Ethernet NIC
        Physical Address. . . . . . . . . : 00-26-B9-DC-87-F6
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 24.131.121.227
        Subnet Mask . . . . . . . . . . . : 255.255.252.0
        Default Gateway . . . . . . . . . : 24.131.120.1
        DHCP Server . . . . . . . . . . . : 68.87.75.36
        DNS Servers . . . . . . . . . . . : 68.87.75.198
                                            68.87.64.150
        Lease Obtained. . . . . . . . . . : Tuesday, July 06, 2010 5:13:35 PM
        Lease Expires . . . . . . . . . . : Saturday, July 10, 2010 3:52:28 PM

here you go thank you so much

Author

Commented:
@n2fc, the cable and port are fine. It connects to the network but just can't access the internet. Like i said, when i plug the cable into my xp laptop, internet works fine so there's nothing wrong with the cable or modem.
1) It looks like you are connecting to a Comcast cable modem directly without a router.

2) If the IPCONFIG output above is from the XP machine, and you are then connecting the WIN7 box to the cable modem, you will need to power-cycle the modem before changing the equipment.  You cannot change PC's "on the fly" with Comcast cable modem's... they need to be reset between equipment changes.

3) If you are trying to connect BOTH PC's to the cable modem at the same time (e.g. thru an ethernet switch/hub) this WILL NOT work!  You will need to insert a router into the mix to NAT the cable modem.
Also, the port I was referring to was the ethernet port on the new PC!  It is not unheard of for it to be bad!

You might also try doing the same (ipconfig /all) on the windows 7 pc after connection as well... just to compare!
The most common working solution for your error is to disable IPV6 for the adapter in question.   Since you are (presumably) connecting directly to the cable modem, it is probably just not IPV6 compatible.  If you restrict the adapter to IPV4 only, reset the modem before changing PC's, it should work just fine presuming all equipment is otherwise functional!

Author

Commented:
THANKS A LOT!

Author

Commented:
"You cannot change PC's "on the fly" with Comcast cable modem's... they need to be reset between equipment changes."
Looks like that was the problem lol.
WOW thank you. That thought had not even crossed my mind! but then again I'm a noob lol. thanks  a lot n2fc!

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