Windows 7 clients experience intermittent internet / network drop outs


I have an issue with a client where the windows 7 clients are experiencing intermittent internet / network drop outs. XP clents seem to be fine. These clients are members of a SBS 2003 domain.
The first sign is the client does not have internet connectivity. it also seems that were unable to ping the gateway at this point. disabling and enabling the nic resolves the issue for a short while. This issue happens randomly throughout the day. All of our Win 7 are having the same issue. I have tried the following...

Disabled Power managment on the NIC
Disabled IPv6
Disabled the firewalls
Removed Antivirus
set HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\NlaSvc\Parameters\Internet\EnableActiveProbing = 0
installed the latest revision of NIC drivers

all without success, can anyone help??

Many thanks in advance

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uninstall & then Reinstall your network drivers.

This fixed my problem like this.

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Iain MacMillanIT Regional Manager - UKCommented:
check you have the latest NIC drivers for your adapter, and also in the advanced adapter properties, disable the TCP Checksum Offload for both IPv4 and 6 (all other IPv6 options should also show as disabled - UDP Checksum Offload and Large Send Offload).

see if this helps any.
IntechnicalAuthor Commented:
Hi Lain,

I have just implamented your suggestion.. will monitor for the nex few hours.. thanks for the reply guys
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Iain MacMillanIT Regional Manager - UKCommented:
your welcome, lets hope it works.

IntechnicalAuthor Commented:
Still having the same issue, Any more ideas? seems microsoft are also struggling with this one :-(
did you try mine?
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Windows 7

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