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Vista - network cable unplugged error

Hi All
This one is driving me nuts.  This problem is on our first commercial custom build PC with Vista and all is peachy except when I connect the PC to the customer's home D-Link based router network (which I installed), I receive the message from Vista that the network cable is unplugged.

Here is the scenario and all tests conducted so far:
1) removed and discarded customer's original Cat5e patch lead.  Cable tested a new Cat5e Patch fly lead - tested OK.  Connected this to wall RJ45 outlet and cable tested from new fly lead to end of cable at remote positioned router - test OK.
2) Connected cable back to router and then connected new fly patch lead to my HP XP Pro laptop - DHCP good, IP address assigned an Internet connection established fine.
3) Connected new patch lead to Vista PC - network cable is unplugged message.
4) removed Vista PC back to company base and connected to patch lead on test bench, (where it was originally built) and instant DHCP connection to our network and Internett reached perfectly!
5) Return to customer - connected Vista PC again to new patch lead - network cable is unplugged message again.
6) On customer premises installed into Vista PC a brand new Netgear PCI LAN card - Realtek chip based.  Connected this to new patch lead - network cable is unplugged message with this adapter as well.
7) Connected a Crossover cable to the onboard Nvidia LAN connector and connected to laptop.  Vista discovers the laptop instantly as an unidentified network.  Repeat same exercise with Netgear LAN adapter and Vista once again discovers the laptop as an unidentfied network.
8) Disconnect laptop and check the new patch lead again in the laptop and still receiving DHCP IP from router to the laptop
9) Connect patch lead once again to both Nvidia and then Netgear adapters - still receiving network cable disconnected message from both adapters.
10) Bang head on desk repeatedly...

So I conclude that both LAN connectors on the PC are fully functional, but for some reason Vista cannot see the signal from the router based network.  I have tried an MS KB registry fix:
http://support.microsoft.com/kb/928233/en-us
just in case there is something weird about the D-Link Router and Vista.  Setting the Dword value as per this fix to either 0 or 1 (hex) makes no difference for either of the LAN adapters.  The D-Link is a combined ADSL modem and router model DSL-524T (for UK Broadband)

I am sure I must have missed something obvious - any ideas?  Pls shout for more information.

Thanks,
C

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Creodus
Asked:
Creodus
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2 Solutions
 
davidwainwrightCommented:
Theres nothing on the router thats rejecting the Vista client's NIC MAC is there?
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trinak96Commented:
Which d-link router are you using ?
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trinak96Commented:
D-Link compatibility list for vista, check your router version :
http://www.dlink.com/products/vista-support/
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CreodusAuthor Commented:
Hi David - no its settings are left as default in the main - I will check this though.

Hi Trinak - it's a UK model DSL-524T - I will check the corresponding UK compat site from your link and see what that says.  Never heard of an OS being so fussy at network level!

C
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knightrider2k2Commented:
Check with some other d-link router/modem and another make/model router if possible.

This will tell you for sure if it is a problem with the pc or just compatibility issue.
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willcompCommented:
Try removing any PCI cards installed. Have seen IRQ conflicts, but your symptoms do not indicate such is the case. Won't hurt to be sure though. This is one of those glitches that makes no sense.
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trinak96Commented:
One other thing to try is to check whether IPv6 is enabled on the card. The D-Link may not be compatible. Try to remove IPv6 from NIC setup, if its there, and leave only v4 running. There have been a few issues like this around on ther forums, and different things work for different people.
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CreodusAuthor Commented:
Thanks all for input.

The router is the problem! - I am stunned - I have never seen a router ever rejected by an OS before in all these years, so wouldn't have suspected it.  I even tried upgrading the firmware - made no difference.  We are Netgear Powershift dealers and rarely use D-Link - this was an unusual installation that required the use of one.  A simple Netgear connected instantly to the Vista PC with no issue.

There was no need for the MS KB reg fix with the Netgear nor disabling the IPv6 stack.  Incidentally you cannot uninstall IPv6 from Vista or Server 2008:
http://www.microsoft.com/technet/network/ipv6/ipv6faq.mspx

Thanks again all, C
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willcompCommented:
Who'd a thunk it!

Although you cannot uninstall IPv6, you can uncheck it in list of protocols for NIC - thus disabling for that connection.
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