Windows 7 keeps losing its IP configuration


A Windows 7 64bit Lenovo Thinkpad e540 seems as if it keeps losing its IP configuration (+ ESET NOD32)

The user tries to reach certain websites and obtains a can't reach error instead, with IE, FF and Chrome
One of the sites is her bank's website - Google or MSN websites however obtain the same treatment

Pings to FQDN and IP adresses are answered

If I reset the IP layer:

ipconfig /flushdns
netsh winsock reset
netsh int ipv4 reset catalog
netsh int ip reset c:\reset.txt

...and reboot the computer, the user can access all websites again

She noticed that this morning she was on the bank's website at 8.50am and then when she tried to access the site again at 8.57am the site was unreachable
Nothing really happened in between except for a print out of a bank statement and a telephone call

I'm stumped

any ideas ?

Yann ShukorOwnerAsked:
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Austin TexasConnect With a Mentor Systems EngineerCommented:
Given that information, I concur with mpfister that checking the drivers is a next step.

If that falls short or doesn't work, I would also suggest that you consider putting a new network interface card on it and then see if the problem persists.
Austin TexasSystems EngineerCommented:
I am assuming there are other people on the network and they are not experiencing the same issues.

What does the network look like? Ethernet? WiFi? What network equipment?
Austin TexasSystems EngineerCommented:
I recently dealt with a case where devices on a WiFi network using a LinkSys EA4500 were periodically losing connectivity *individually*. I discovered the problem would resolve on reboot of the EA4500 and I also noticed it was running hot, so I improved airflow to the EA4500 and so far so good. Not what I would have expected.
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Michael PfisterConnect With a Mentor Commented:
Check if you have the latest drivers for LAN/WLAN for your model on the Lenovo web site:
Ertan SENOYARConnect With a Mentor Commented:
DHCP and DNS client Services need to be running all the time in order to get and renew IP lease from DHCP.Can you check if your DHCP and DNS client services running while you are experiencing trouble..
Dan ArseneauConnect With a Mentor Commented:
Open CMD as Administrator
Type in:

Set devmgr_show_nonpresent_devices=1
start devmgmt.msc

Open in new window

View menu -> Show Hidden Devices..
Open up Network Adapters
See if you have any duplicate devices.  If you do, and they're greyed out, right-click and uninstall it
Yann ShukorOwnerAuthor Commented:
Thanks for your suggestions Tex
 - PC is connected via Ethernet - Zyxel 24port Switch
 - Other users are all fine
 - This situation occurs at both sites where this user works

Thanks for your suggestions mpfister:
 - I will check if the drivers and bios are up to date

Thanks for your suggestions Ertan:
 - these two services are in effect and set to automatic

Thanks for your suggestions Dan:
 - will check this tomorrow
marsiliesConnect With a Mentor Commented:
Is it all websites, or just secure websites?

Make sure the date and time settings are correct on the PC.

Check the proxy settings to make sure malware isn't rerouting traffic. Also do a malware scan.
Yann ShukorOwnerAuthor Commented:
Well folks

DNS and DHCP services are on and launched automatically

There are no duplicate hidden network interfaces

I updated the BIOS and WIFI drivers, and reinstalled LAN drivers, but the situation is occuring
any other suggestions ?

Austin TexasSystems EngineerCommented:
Have you tried an another NIC like a USB NIC to see if you get similar results? If you get the same results with another NIC then we would know it is not a hardware issue.

On the other hand, if the new NIC works reliably, then we could probably surmise that it is localized to the NIC or the driver.
Yann ShukorOwnerAuthor Commented:
Thanks Austin, I have ordered one off amazon and will test this
For the moment I asked that the user stick to using Wifi access to see if this issue is related to the network interface
Dan ArseneauCommented:
Are they carrying the Ethernet cable with them?  Make sure you swap the cable also.
Yann ShukorOwnerAuthor Commented:
Nope, different cable each time
Dan ArseneauCommented:
With all your work, I agree that the adapter is probably gone bad.  USB to Ethernet is your Austin mentioned.
Austin TexasSystems EngineerCommented:
Thanks for the points! Did the new NIC resolve the issue?
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