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Windows 7: A quest for internet access ( unidentified network and error 651 )

17 Jan 2014   #1

Windows 7 64
A quest for internet access ( unidentified network and error 651 )

I'm stuck with one of the most harsh problems i had to deal with, regarding fixing my computer.Im trying to solve it for days ( have
searched a lot on the web ) and no results so far.
The problem is about network and internet access.

I have a broadband ADSL connection and until this problem showed up, my computer had regular internet access on Windows 7, with my onboard network card connected to
the ADSL modem ( TP-LINK TD-8816 ), no routers. Suddenly ( after coming from stand by ), my pc had no internet access and when i checked the Local Area Connection, the status
showed as Network unidentified, which doesnt even let me access the configuration page of the modem by its ip address.I tried to
start my ADSL connection ( modem was on bridge mode ) and Windows 7 points me error 651.
I tried to diagnose the problem with Windows and it says my Local Area Connection
doesnt have a valid ip configuration.

Quickly, i pluged my ADSL modem with the same RJ-45 cable on my Dell netbook to see if the problem was my computer or with the modem.
Then i saw that my Dell's network card was behaving regularly with my modem and i could both access the modem configuration page
as well as have internet access.

So, imediately i discarded my broadband provider,my modem and the cable as the fault. I was sure the problem was on my PC ( either hardware or software ).
I started with software-, i tried a lot of things like updating the driver, searching services like Bonjour or ##ID_String type ( it didn't have any ), removing IPV6,
installing reliable multicast protocol, assigning the modem gateway ip manually.
None of these worked.
Then i decided to format my HD and re-install Windows 7 from scratch.
After that, oddly, the problem still persisted. That made me go to the hardware and blame solely my onboard network card ....
Then i went to buy a new network card. The network card i chose was the Encore ENLGA-1320 , which oddly had the same Realtek PCI GBE controller, seeming exactly like i had bought
my old onboard network card.
So, i installed it and i didnt even have to install any driver because the Encore's driver was the same as my onboard's network card driver.
After connecting the modem to the new network card, the problem still persists : Network unidentified, and no internet access with error 651.

But then i made some test. I pluged my D-LINK Router on the new network adapter and it recognized it, i was able to access its configuration page.

Not on the old network adapter ( onboard one ), so it suggests my old network adapter was faulty.

Checking the ipconfig /all on the ADSL Modem i get this : , according to the unidentified network ( after trying to identify for some seconds ).

Then, a second later, changing one end of the RJ-45 cable from the ADSL-modem to the D-Link router, my network adapter quickly identifies
a network and i get a perfectly fine ipconfig /all :

To sum up the confusion :
On one side i get the message that the ADSL modem is okay because even tho it doesnt work on my new network adapter from my Desktop PC, it works perfectly fine when pluged to my Dell netbook.
But on the other side, i get that my pc software-hardware ( windows and my new network card ) are okay and maybe the problem
is still with the ADSL modem because even tho my new network adapter doesnt recognize the ADSL modem, it recognizes perfectly well my D-Link router ( not giving unidentified network message ).

Any clues ? Should i buy a new ADSL modem even tho it works on my dell netbook ?

Thanks a lot, it really means a lot for me to get this figured out.

My System SpecsSystem Spec
17 Jan 2014   #2

Win7 & Win8 64bit

Hello, and Welcome to Seven Forums,

From your computer's Device Manager try changing the Speed & Duplex of your Ethernet adapter from Auto Negotiation to either 1Gig full duplex (if your modem supports Gig, if not try changing it to 100Mpbs) then see if you can connect. See attached image.

Also, make sure that you are using a straight/patch Cat5e or higher Ethernet cable.

Attached Images
A quest for internet access ( unidentified network and error 651 )-speed-duplex.png 
My System SpecsSystem Spec

 A quest for internet access ( unidentified network and error 651 )

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