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Windows 7 unidentified network on LAN

Forum General Networking : General Discussion Windows 7 unidentified network on LAN

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jumpnmove   01-16-2011 at 02:14:30 AM

I'm at my wits end. I'm about to like burn another Windows 7 disk just so I can break it in half. Never had this sort of unsolvable problem in XP. But i digress.

Ok. New computer. Just built.
-Fresh (clean) install of Windows 7 Professional with a key from my school's MSDNAA account.
-Updated the mobo drivers using the provided CD

CPU- Intel i5-2500k
Mobo- MSI P67A-C45 with Fast Ethernet by Realtek RTL8111E

Network Card either says "No ethernet cable detected" or after minute or two "Unidentified Network - Public Network - No Network Access"

When running Ipconfig. Here are the results.

Quote :

Windows IP Configuration

Host Name . . . . . . . . . . . . : HAFTANK
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
Physical Address. . . . . . . . . : 6C-62-6D-A4-EF-89
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::a09c:f007:44ff:c761%15(Preferred)
Autoconfiguration IPv4 Address. . : 169.254.199.97(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 258761325
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-14-C3-B9-C3-6C-62-6D-A4-EF-89
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{3EE58CEA-BDE7-468C-A6C8-352B1AC65231}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes



Key things. The IPv4 Address is bogus and Default Gateway is **Blank**

I have literally tried EVERY windows 7 unidentified network fix I can google.
- Ipconfig /release then /renew : This fails with the error "An Error occurred while releasing interface Loopback Pseudo-Interface 1: The system cannot find the file specified. The /renew never get passed the configuration stage and gives the same error along with connection to DHCP server has timed out. << Duh it's trying to access bogus IP paths.
-The Bonjour fix is irrelevant as this is a fresh install and is not installed
-The DHCP Broadcast flag Broadcast does NOT affect anything whether it is enabled or disabled.
-TCP/IP reset does nothing
-The Default Gateway of 0.0.0.0 Default is not the culprit.

I have uninstalled the Network Drivers. Restarted. Installed new ones.
I have completely reinstalled Windows 7 with a reformat the hdd.
I have completely powered off, disconnected/drained power, and reset the mobo via CMOS reset.
I have reset the router, a DLink DIR-615, to orginal settings.
I have disabled IPv6, but it makes no difference.
I have reserved an IP in the router manually, and told the network adapter the settings, still it cannot connect to the router.
I have removed the router and connected directly to the modem. Windows 7 still can not automatically or manual receive proper IP and DNS settings.


I've pretty much checked and rechecked and reinstalled every possible solution.

The adapter is recognized as a properly working device in the hardware. The yellow led pulses with according that its trying to communicate with something, the green light for proper connection never appears.

Doesn't appear to be hardware problem. Oh, yes and the cable and router both work fine between a PS3, Laptop with Xp, another Wired Desktop with Windows 7, and even wifi phones have no problem connecting.

I've also tried old realtek drivers, new realtek drivers and the included CD drivers.


I'm mentally exhausted. The only option I haven't tried is to use an external wireless network card (well and a wire bridge with my laptop but i don't feel like configuring that). But I shouldn't have to buy a wifi card just to connect to the internet. Ethernet ports are supposed to plug n play. Ha yeeaaaaa rigghttttttt.

So anyone have any ideas???

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jumpnmove   01-16-2011 at 02:34:04 AM

Sooo. I don't know how but out of sheer desperation I moved the computer and switched from a 15ft to a 3ft cable. Magically works now...Yet I just plugged in both my roommate and my laptop (turned off the wireless cards) and the cable works for both laptops.

And wowwwwwww just dawned on me, baked out of my mind to check the cable.

Turns out it was a cat5 cable and not a cat5e cable, which couldnt communicate with the Fast Ethernet port in the Mobo.

By far the most retarded - uh wut? - moment I've encountered.

This can be closed.

Reply to jumpnmove
therende   11-12-2011 at 12:16:27 AM

Another way to cause the error is to define a default gateway on another network (for instance a gateway on a work network and you are currently on your home network).

Reply to therende
Davidpcs   12-13-2011 at 12:55:41 AM

My problem started after loading the drivers that came with my motherboard, the Nvidia drivers from BioStar started the problem, before that the built in driver in Win 7 Ultimate worked just fine, I uninstalled just the Nvidia driver for my network adapter and left all the other drivers in place and now I boot up and have the one proper network listed and am conneted to the Internet, before my solution was to disable then reenable the network adapter each reboot, then it would auto detect and just give me the one network, but after rebooting I would have to do it again.. Now it works perfectly after leaving the default Ethernet driver that came with Win 7 Ultimate

Reply to Davidpcs
westsidebill   01-17-2012 at 04:53:44 AM

I know this thread is old, but I have been chasing my tail for a couple of days trying to get rid of the "unidentified network" issue. I tried everything...reset TCPIP, reset Winsock, removed the 0.0.0.0 default route, removed the nic to get Win 7 to reinstall it on boot, disabled bonjour, set a static IP/gateway, edited the registry to set a DHCP flag....basically everything I could find out there...nothing worked. As I was pulling some more hair out, I had a thought back to my old hardware days....check the Speed & Duplex of the NIC! Once I followed the steps below, and rebooted...up came my network...and no more "unidentified network"!! :-)

There are several ways to do this, but here is the one used...Open Network and Sharing Center, Click on "Change adapter settings", right-click on the NIC and select "Properties", then click the "Configure" button. Select the "Advanced" tab (I think pretty much any NIC should have this), scroll down until you find "Speed & Duplex". The default value for this setting is "Auto Negotiation"...change it to a fixed value (I used 100 Mbps Full Duplex). You may have to try a couple of the settings (there is no fear of causing any issues by changing this setting) in order to find what works best for your NIC...and the switch/hub/router that you are connected to.

Bottom line, my issue (and maybe yours, and maybe not) was caused by the NIC having trouble negotiating the connection speed to the network...since it couldn't get a solid connection, but knew there was a network there, Win7 classifies it as an "unidentified network". Once you set a fixed speed & duplex, the NIC immediately connects at the selected speed. This of course assumes you have set a speed & duplex that all components on your network is capable of running at (if you only have a 100Mbps port on your router, don't set the NIC to 1Gbps).

I hope this work for someone out there.

Reply to westsidebill
akyeame   04-27-2012 at 01:31:45 PM

westsidebill, your fix worked. i switched to a speed without any change, but when i went back to auto negotiation it showed up. I appreciate it

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