Intermittent internet for Windows 7 Laptops
Posted on 2011-02-12
Hello, I have a head scratcher
I have an issue with a client where the windows 7 clients are experiencing intermittent internet / network drop outs. XP clients seem to be fine. These clients are members of a SBS 2003 domain.
The first sign is the client does not have internet connectivity.
The machines can still access all network resources.
While IE and/or Firefox are “clocking” trying to open a page, I was able to successfully perform an NS Lookup in command line. External DNS was verified.
Disabling and enabling the NIC ‘sometimes’ resolves the issue for a short while.
This issue happens randomly throughout the day.
Three of the affected laptops are HP’s-- 2 dv4’s and one dv6
These machines worked fine with windows 7 home premium. (Not members of the domain)
All of our Win 7 are having the same issue. I have tried the following...
Disabled Power management on the NIC
Disabled the firewalls
set HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\NlaSvc\Parameters\Internet\EnableActiveProbing = 0
installed the latest revision of NIC drivers
Removed and reinstalled NIC drivers/Adapters
Formatted and reinstalled windows on one machine
We did an anytime upgrade to win7 pro, joined them to the domain and a few days later the problem began.
I first thought the drivers were an issue so I replaced/reinstalled drivers. Still persisted
Then I thought it was the users profile, turns out the problem affects even the local users and domain admins logins as well.
I formatted the hard drive on one dv4 and did a clean reinstall of win 7 pro 32 bit to see if that changed anything. It didn’t. Still would happen with a clean machine.
Yesterday while onsite; I experienced the issue on my personal laptop, a HP dv6700. I had not had any issues before yesterday.
I had three machines set up on a counter:
Left to right LT1 LT2 and LT 3:
While transferring data from LT 1 to server share, I suddenly lost Web access on Lt2. I tried LT1 and it worked. Then on LT3 I tried and it failed. Tried LT 1 again and it failed. Then LT2 worked. Then LT 3 worked. LT1 also worked. Then LT 3 stopped working, so did LT1 but LT 2 worked.
I was able to log into the two wireless access points with all 3 even though I couldn’t get an external website to open. On LT3 I was able to log into the Firewall a ZyWall USG 100.
I then looked at the log file and saw that the IP addresses from all 4 laptops (mine was included) were being blocked access to the internet. (INTERMITTENTLY)
I am beside myself trying figure out why
---only the laptops with windows 7 are affected
---This happens on wireless and hardwired connection
---It is intermittent
---And only started a couple of weeks ago.
Zwall USG 100 firmware version 2.20(AQQ.1) / 1.12 / 2010-05-06 11:21:04
Laptops affected are 2 hp dv4’s 1 HP dv6, 1 HP dv6700
Can anyone offer any new ideas or has anyone else seen this?
Thanks in advance for helping me.