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Windows 7: LAN doesn't have a valid IP configuration! (ICS prob.)

06 Nov 2009   #11

Windows 7 Ultimate (64 bit)

Quote   Quote: Originally Posted by torrentg View Post
Start menu search box. Copy and paste services.msc to it. Hit enter. Look at Internet Connection Sharing (ICS) service. Set it to automatic and start it too.
It was already started and set to automatic.

Attached Images
LAN doesn't have a valid IP configuration! (ICS prob.)-ics.png 
My System SpecsSystem Spec
06 Nov 2009   #12

Windows 7 Ultimate (64 bit)

I think i found a problem...
One my old computer ICS service was not started and when i tried to start it this error came up.

Attached Images
LAN doesn't have a valid IP configuration! (ICS prob.)-problem.png 
My System SpecsSystem Spec
06 Nov 2009   #13

7600.20510 x86

This might help.

Windows XP's Internet Connection Sharing opens up client connectivity options with Server Publishing


Make sure Windows Firewall is running on both machines too.
My System SpecsSystem Spec

06 Nov 2009   #14

Windows 7 Ultimate (64 bit)

Windows 7 is little different from XP and there is no ,,Advanced tab'' in External Properties.
I tried to find it somewhere else but i couldn't...
My System SpecsSystem Spec
06 Nov 2009   #15

Windows 7 Ultimate (64 bit)

Does anybody know how to start ICS service if i have this error?????

,,The Internet Connection Sharing (ICS) service on Local Computer started and then stopped. Some services stop automatically if they are not in use by other services or programs''
My System SpecsSystem Spec
08 Nov 2009   #16

Windows 7 Ultimate (64 bit)

This is definitely the weirdest problem i ever had with my computer...
But i found a solution
I connected my modem to the old computer and then enabled ICS on it...
After that both computers had internet...
i was shocked that it worked...

I still don't know what the problem was but the important thing is that ICS works now.

My System SpecsSystem Spec
13 Nov 2009   #17

Windows 7

I hate it when some one fixes their computer and never reports the fix, so here is what worked for me.

First of all I live in a Best Western Hotel (not a motel) and they have EXCELLENT tech support. The BW tech support guy unblocked me from wherever he lives at the other end of the phone. Here's what happened and what he did.

The Problem
My computer's wireless and Ethernet adapters were physically blocked from the router. I had an Unknown network and got the dreaded 651 error and the message, “Local area connection doesn't have a valid IP configuration.”

How'd that happen?
I was using an add-on to Firefox to check my bookmarks for dead links. I can't remember which add-on it was because I reverted to an earlier version of my OS in an attempt to fix it. When it reverted it deleted the add-on. Today when I went to find it again, it is not available. Wonder why??? The kicker to all this is that I was watching my computer when the problem happened. It was like someone flipped a switch turning off my Ethernet adapter. I was on the wired connection (Ethernet) and switched to the wireless with no problems...until I tried to check my dead links again. Again the switch flipped off but for my Wireless adapter. RIGHT IN FRONT OF ME! Then I was really dead in the water. The problem was that the Best Western firewall saw my computer checking my bookmarks. The computer checked more than 300 websites within 1 minute and the firewall thought my computer had a virus. Thinking it had a virus the firewall blocked the physical address of my Ethernet adapter (first) and my wireless adapter (second) from further connections.

The Fix
  1. Start by running cmd from the start menu
  2. Type “ipconfig /all” without the quotes
  3. Write down the physical address of which ever connection is/are not working. If you are hard wired to your router, then use the Ethernet adapter physical address. If you are running wireless, then use the Wireless LAN adapter. I had to do this for both.
  4. Go to your router's firewall and find the physical addresses of the connections.
  5. Find the physical address(s) of your blocked adapter(s) and unblock it.

Sorry I can't be more specific for everyone's router but that is the general idea. I'm using Win 7 but I don't think it makes any difference.

YOUR problem
If you did not do anything unnatural that a firewall might have picked up as a virus, then you might have an actual virus that your outbound firewall blocked.
My System SpecsSystem Spec
07 Mar 2011   #18


Hi guys!

I have had the same problem for a few days now, and have searched numerous forums and gone through hell and high water to fix it. nothing helped until I found the ultimate solution that will help everyone:


During this time you must keep your router/modem turned off, and after the ISP has fixed the problem (in my case it took half an hour) you must restart your machine with the router/modem on and connected. From then on it should be like nothing ever happened.

Just for the fun of it, here's a list of things I have tried without results:

release/renew ipconfig
restarting modem/router and computer about a zillion times
changing LAN card
creating a static IP
resetting winsock in command prompt
reinstalling Win7
reinstalling XP (I had a dual boot and I did both, losing all installations)
manually entering IP address
disabling/enabling local area connection
plugging and unplugging LAN cable
uninstalling and reinstalling LAN card driver
resetting modem/router using the reset button

And after all this, all it took was just a phone call.
This is because your ISP is THE ONLY authority when it comes to configuring your IP address. In this case, it can only be done from the outside. This is also the reason why Microsoft didn't announce any patches or fixes for this problem, because it is not their problem and responsibility.

Only one question remains, WHY is this happening? Noone has been able to answer this, and I have read tons of forum posts about it. Maybe even the guys that made Windows 7 don't know it.

I am going to copy this post on several other forums because I have seen the trouble that people are having with this problem.

If you find out why this is happening, please post it here.
My System SpecsSystem Spec
20 Sep 2012   #19

Windows 7 Home Premium 64-Bit
Error 1075 on W7HP

I'm trying to get ICS to work so I can share the internet from my laptop with my Xbox 360. I'm getting this error, and it says that "The dependency service does not exist or has been marked for deletion. How do I fix this?
My System SpecsSystem Spec

 LAN doesn't have a valid IP configuration! (ICS prob.)

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