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Wireless connection re-authentication

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by mccabe

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I have a Cisco 1100 wap that is working well but every now and then my connection on my ThinkPad drops and the wireless icon in my system tray show that wireless is attempting to re-authenticate with the IAS radius server. Eventually is re-connectesd. Curious if anyone has seen this and has some ideas ?
Client computer runs XPP and we have IAS running on Windows 2003 std server (its a DC too)

9 replies

by cactus pete

Do you have the latest Cisco drivers for the Wireless NIC?

Have you always been experiencing this?

by cp7212

I manage the client side of 50+ wireless "kiosks" at my workplace. You cannot believe how many "random" events we had at first. Try to track a pattern. Time? Location? Microwave ovens block RF, cordless devices will interfere, and unbelievably, a chain-link fence will act as a wave and block a 2.4 GHz signal also. I had to go with an Omni directional antenna to get the signal under a deck. Post more info, even anything you might think is irrelevant. I'll get back to you.

by mccabe

seems to be in the afternoon-Im about 15 feet away and one drywall wall away from the microwave in our staff kitchen. Im wonder if thats the culprit

by mccabe

Its a built Intel / IBM oem setup, besides my radio signal stays strong - its the re-authentication that happens

by jdclyde

My sister had problems with here wireless. It turned out that her phone was causing interferance with the WIFI. Whenever she got a phone call she would get disconnected.

Her access point was plugged into cable.

Anything else that could cause interferance? Microwave?

by stane

HI, I saw similar problems before. Please try to privent wireless card in your laptom from going to power save mode.

by cp7212

Windows will throw your wireless adapter and USB ports into a power save mode, supposedly. These settings can be found in the hardware device manager, in the properties settings of the devices. I have tried unticking all of the boxes (I have found eleven so far) and it didn't make a difference. The only thing that I have found infallible is either cabling the client or location, location, location.

by cp7212

Rule of thumb for microwave ovens: Most microwave ovens will affect a 50' radius. Of course, the closer you get to the outside of the radius, the weaker the interference. I found that we use one megawatt ovens, which operates on a 2.45 GHz frequency. That's just too damn close to 2.4 GHz to not move the client machine. That is with a cinder block wall between them. You can look on the back of the microwave oven and it should have the frequency listed.

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