Losing network connection after sleep

[rokilne]

My NR10E/S running Windows Vista Home Premium is connected to a cable modem via its network card and CAT5 cable. The connection works OK until the laptop goes into sleep mode. When it wakes it has lost the network connection and I have to reboot it to go online. When the connection is there, the system tray icon says "Currently connected to Network 2, Access: Local and Internet". After waking from sleep the icon says "Currently connected to unidentified network, Access: Local only".
I have tried going into Device Manager, right-clicking on the network card and unchecking "Allow the computer to turn off this device to save power" but it made no difference.
If I go into the Network Sharing Center, Manage network connections, I only see "Local Area Connection - Access to Local only" and "Wireless Network Connection - not connected" I don't yet have a wireless router so I can't try that. I've tried running "Diagnose and repair" from the Systray icon but it failed every time. I've also tried disable/enable Local Area Network from Control Panel > Network & Sharing Center > Manage Network Connections without success. If I get a command prompt and do ipconfig /release it disconnects, but when I do ipconfig/renew it says "An error occurred while renewing interface Local Area Connection: unable to contact your DHCP server. Request has timed out". When I swap the CAT5 cable over to my desktop, running XP Home, ipconfig /release - ipconfig/renew work OK.
It seems that I need to reboot the laptop every time to restore the network connection after it sleeps.
I would appreciate any advice about retaining the internet connection during the sleep – wake mode of operating.

[Blencogo]

Hi pictup and welcome to Club Vaio.

Try this Microsoft fix it may help: -

http://support.microsoft.com/kb/928233/en-us

Unfortunately, there have been a few ongoing problems with Vista's Networking!!!

[rokilne]

Thank you for the response. I followed the advice on the Microsoft link, but it says "click the (GUID) subkey that corresponds to the network adapter that is connected to the network."

Unfortunately there are three {GUIDES) under the Interfaces subkey and I don't know which applies to my network adapter. The GUIDES are:
(1) {065EF4B3-A805-44C1-BE8E-B761BEFE5AFB}
(2) {3a539854-6a70-11db-887c-806e6f6e6963}
(3) {808E30BC-1DA5-4992-BC60-0B9F0AF50CD1}

I've looked in Device Manager and Manage network Connections but I can't see anything that relates to the Registry entries. Also I don't understand why there are three GUIDES when I only have two devices to connect to the Net i.e. a network card and a wireless card.

Can you please help?

[Blencogo]

I think the best way is to right-click on each {GUID} and highlight IP or DHCP then choose Modify to read the data. Look for the Key that gives the IP address/DHCP Server Address currently in use by your Network.

If in doubt, amend all three!

[rokilne]

I wasn't sure so I amended all three, but no change. I then did what the MS fix says further down the page and set DhcpConnForceBroadcastFlag to 0 for all three. Still no change so I left the last change in and went back to DhcpConnEnableBcastFlagToggle and set all three to 0. Still the same – after the laptop sleeps I have to reboot it to get a network connection.

[rokilne]

I've just managed to fix it by uninstalling the driver for the network card and then rebooting the laptop so the Vista installed the generic driver. It's now OK. I don't know why I didn't try that before.

[ctsirkas]

Have tried everything. Only thing that finaly worked is uninstall the driver and deleting driver files and then reinstalling it.