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[SOLVED] Can't connect to internet

3318 Views 7 Replies 2 Participants Last post by  Hayds510
I've been having problems trying to connect to the internet on my Toshiba satellite laptop through a friends modem-router. it connects to the network but there is a red cross between the network and the internet on the network map.
on their other computers (macs) they can connect to the internet fine (infact i'm typing this using one of them). it says it can't connect to the primary DNS server. we've tried repairing it with the auto repair function, it says it's not getting a response.. we've tried changing the settings but nothing has made a difference, we've reset the router, restarted my computer.

i DO know it's possible to fix it without having to consult the isp provider or anything like that, it happened once in the past when i was here with my laptop. i remember there was something i changed, not a real complex technical setup adjustment, just something real simple.. i was half asleep when i did it but when i saw it managed to solve it i was surprised... Though i can't think what exactly it was that happened. it worked fine after that a few times i was here however just now its started to not work again in the same way. any clues what can be done to solve this?

the modem router is a netgear DG834 V4
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Re: Can't connect to internet

what version of Windows are you using on the laptop?

Let's see this with a wired connection to the laptop to the router.

Hold the Windows key and press R, then type CMD to open a command prompt:

In the command prompt window that opens, type type the following command:

Note that there is a space before the /ALL, but there is NOT a space after the / in the following command.


Right click in the command window and choose Select All, then hit Enter to copy the contents to the clipboard.
Paste the results in a message here.

If you are on a machine with no network connection, use a floppy, USB disk, or a CD-RW disk to transfer a text file with the information to allow pasting it here.
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Re: Can't connect to internet

Yep, showing me a good connection doesn't help in debugging it. :wink:

I'd remove any stored wireless network profiles from the machine and then try to connect to the problem network.

Depending on the exact router, there are also some fixes for Vista to allow compatibility that you might consider.

Changes that may help to increase the compatibility of Vista with older networking devices:

Disable the IP Helper service:

1. Hold the Windows key and type R, enter "services.msc" (without the quotes) and press Enter
2. Scroll down to the IP Helper service, right click on it and select Properties
3. In the dropdown box that says "Automatic" or "Manual", set it to Disabled and then click on "Apply"
4. Then click on "Stop" to stop the service from running in the current session
5. Click OK to exit the dialog

Disable IPv6:

1. Hold the Windows key and type R, enter "ncpa.cpl" (without the quotes) and press Enter
2. Right click on each network connection and select "Properties"
3. Remove the checkmark from the box next to "Internet Protocol Version 6 (TCP/IPv6)
4. Click OK to exit the dialog

NOTE: You should do this for each network connection.

Disable the DHCP Broadcast Flag:

  1. Hold the Windows key and type R, enter regedit and press Enter.
  2. Locate and then click the following registry subkey:
  3. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{GUID}
  4. In this registry path, click the (GUID) subkey to be updated.
  5. If the key DhcpConnForceBroadcastFlag does not exist, use the Edit menu, point to New, and then click DWORD (32-bit) Value. In the New Value #1 box, type DhcpConnForceBroadcastFlag, and then press ENTER. If the key exists, skip this step.
  6. Right-click DhcpConnForceBroadcastFlag, and then click Modify.
  7. In the Value data box, type 0, and then click OK.
  8. Close Registry Editor.
NOTE: You should do this for each and every GUID subkey.
NOTE2: (GUID) is a mnemonic for the individual subkeys, the actual text "GUID" does not appaer.

The only program I'm aware of that currently relies on IPv6 is the new Windows Meeting Space. The first 2 changes will cause that program not to work - but will leave all of your normal (IPv4) connections unaffected. If it causes problems that you can't overcome, simply revert back to the original settings.
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Re: Can't connect to internet

You appear to have overridden some of the automatic addressing settings, fix those and it'll probably work.

Configure DHCP for Windows Vista & Windows 7

  1. Click on the Start menu, and select Control Panel.
  2. Click on Network and Internet. (Skip this step if you do not see this Control Panel item.)
  3. Click on Network and Sharing Center.
  4. Click on Manage network connections.
  5. Right click on Connection you wish to change and choose Properties. If Windows say it needs your permission to continue, click Continue.
  6. Select Internet Protocol Version 4(TCP/IPv4) and click Properties.
  7. Select Obtain an IP address automatically.
  8. Select Obtain DNS server address automatically.
  9. Click OK to close the TCP/IP Properties window.
  10. Click OK to close the Local Area Connection Properties window.
  11. Click Close to close the Network Connections window.
  12. Click Close to close the Control Panel window.
  13. Restart your computer.
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