Laptop Wireless issues with Windows 7

We are experiencing issues with some Laptops running Windows 7. The wireless connection keeps on dropping every 10-15 seconds and some laptops show the "Limited Connectivity" icon in taskbar. This problem is appearing in almost 8-10 laptops while around 30-35 laptops are working fine without any issue.

We recently changed our wireless access points to Cisco Linksys thinking the old Aruba wireless is causing this issue but this problem is appearing with linksys as well.

Please help.
altuwairqiAsked:
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npinfotechCommented:
My thought is that this is not a Windows issue.  Looking at your log, you are using an Intel(R) Centrino(R) Advanced-N 6205 network adapter.  The centrino appears to be a fickle network card.  This link is to a message board full of attempts to solve problems with it: http://communities.intel.com/thread/21134?start=0&tstart=0

Here are links to Intel and Lenovo pages for the card:

http://www.intel.com/p/en_US/support/highlights/wireless/can-6205
http://support.lenovo.com/en_US/downloads/detail.page?LegacyDocID=MIGR-77063
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altuwairqiAuthor Commented:
Please Help
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npinfotechCommented:
The fiirst thing I would do is check to see whether it is the laptop or the signal.  If you take a laptop that doesn't get a signal and place it next to a laptop that does, will it start to connect?

Also, can your network handle 45 simultaneous wireless connections?
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Istvan KalmarHead of IT Security Division Commented:
Hi,

How many APs do you have CISCO recommendtations to allow only 12-15 client per AP!

Best regards,
Istvan
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altuwairqiAuthor Commented:
Thanks for the comments. We are using 5 access points for around 40 laptops, all at seperate locations. One access point is serving for about 8-10 laptops. Signal strength is excellent at all points.
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Istvan KalmarHead of IT Security Division Commented:
HI,

Did you separeted the channels to :

1, 5, 9, 13
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npinfotechCommented:
Here is a page on this issue:

http://www.microsoft.com/athome/setup/wirelesstips.aspx

I'd skip to item #6 first.
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altuwairqiAuthor Commented:
At the same location where 3 laptops are working fine, two laptops are having issues (Side by Side).  We have even tried shifting the laptop with issues to another access point range but same issue so the chances of an interference are almost zero. Attached is the event log of one of the problematic laptop. (showing the wireless events only). The error logged is:

"Failure Reason:The driver disconnected while associating"

Thank you for your help.
events-log-wireless.txt
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Istvan KalmarHead of IT Security Division Commented:
Please mekae site survey with inssider:


www.metageek.net

and provide us the output
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K_WilkeCommented:
One thing I would check is the environmental issues.
What I mean by this is that if this is an older building there might be chicken wire in the walls that are holding up the insulation.  Chicken wire, for some reason, will break up the signals of wireless connections.
Also make sure that there are no large radio towers on the building or close by the building.  They will do some unreal things to wireless connections.
Thanks,
Kelly W.
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npinfotechCommented:
Do the laptops that are not working have the correct IP information in adapter settings?   I have run into situations where apple laptops will pick up weird/incorrect ip and dns information from a wireless connection for no reason.  Manually inputting the information fixed the issue.  I have also run into dell laptops that have had manual ip address/dns entries, and setting them to automatically pick up addresses  helped.

If the IP settings are ok, try adding the latest networrk adapter drivers for your model first.  If that doesn't work, uninstall and then reinstall the adapter.  if tha doesn't work, try a usb network adapter and see if it can pick up a signal.
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altuwairqiAuthor Commented:
Yesterday we disabled the security on the access points and all laptops connected successfully. While with WEP or WPA-personal enabled the same laptops are not able to connect.

Is some thing wrong with those laptops security protocol negotiation? How can we further trouble shoot this issue?

Thank you all for your help.
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Istvan KalmarHead of IT Security Division Commented:
ok,
It seems that you missconfigured one of your AP, so you need to recheck the configurations!

Best regards,
IStvan
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npinfotechCommented:
What brand and model of laptop cannot connect?  There may be an issue we can find with the model and secure wireless connections.
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altuwairqiAuthor Commented:
Different brands of Laptops have the issue (Dell and IBM). Is there a way to trouble shoot this issue as it looks like the windows problem (some protocol mismatch or wrong security policy pushed via AD).
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