We are having a persistent issue with our laptops sporadically losing Remote Desktop connectivity to our 2008 R2 Terminal Servers. I'm hoping to get some input so I can see what I'm missing on this one.
Here's some details on our environment:
All laptops are Dell E5510 running Windows 7 Pro x86 or x64 with latest Windows updates and updated Dell WLAN drivers.
6 Cisco AIR-LAP1141N-A-K9 lightweight access points.
1 Cisco 2504 Wireless LAN Controller (7.0.220.0).
Stacked Cisco 3750G PoE switches (controller and all LAP's connected to this stack) (IOS 12.2(55)SE). No errors on any ports.
3 Windows 2008 R2 Terminal Server virtual machines running on 3 Dell R710/Windows 2008 R2 servers via Hyper-V.
Cisco 2960G switch (IOS 15.0(2)SE4). This switch has all of my physical servers connected to it. The switch is connected to the 3750G stack via fiber. No errors on any ports.
Remote Desktop Services settings controlled via GPO and basically set to optimize for speed (16bit color, no printer redirection, no sound, LPT, or other device redirection, etc.).
Laptops authenticate to LAP devices via NPS on a 2008 R2 Domain Controller.
I am having a nightmare of a time trying to figure out the root cause of this. I am fairly certain it is not a switch, switch cabling, vm host, or vm issue. I've tested all of my cabling with a Fluke tester. I am on the same remote desktops all day long and never have a disconnect. Neither do any of our other employees that use a desktop instead of a laptop. Normally there's only about 10 laptops connected to the WLAN at this location. When some employees come onsite from our other clinics everyone says they get kicked off the remote desktop even more and that the remote desktops become more unresponsive. I'm talking maybe 15 total people only running a remote desktop session over the wireless and those 15 are normally spread out over at least 3 of the 6 LAP's we have on site.
I'm concerned that the wireless controller or the way I have the LAP's configured may be the issue. I believe they are configured to do B/G/N so I wonder if tweaking them to only do G/N would help? We have no need for B. Could NPS on my authentication server be to blame? Some sort of RDS hotfix?
Thoughts/tips?
One thing I've found to be odd is my #5 LAP is literally 10 feet from our nurse station. When I check in my wireless controller, a lot of the laptops want to connect to my #1 LAP, which is much further away. They end up with a slower and less reliable connection. Why wouldn't the laptops connect to the closest LAP with the strongest signal? I've attached an image that shows the location of this #5 LAP in relation to our nurse station area.
Placed this in the Networking group so it may need to be moved to somewhere else.