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Cisco Wireless Controller 4402 Clients dropping connection

Posted on 2009-04-03
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Last Modified: 2013-12-27
We are using a Cisco 4402 wireless controller in one of my facilities and havent had a very good experience.  The clients connect wirelessly to the network and since I put this controller in, I am seeing clients drop connections. The connections will intermittently drop and then reconnect. Of course when this happens they lose their terminal sessions and other network or system access. Prior to this the aps were all autonomous and there were no problems with wireless connectivity but since the addition of the controller, we have seen several issues.  What could cause this? I have included some network info and the traps from today below.

Switch---------------------- AP -   -   -   -   -   -   -  Client
    |
Switch---------------------- AP -   -   -   -   -   -   -  Client
    |
Switch---------------------- AP -   -   -   -   -   -   -  Client
    |      |
    |    Wireless Controller
    |
Router

These are the Traps being Logged

Log System Time Trap
0 Fri Apr 3 13:13:41 2009 Interference Profile Updated to Pass for Base Radio MAC: 00:1e:13:07:9f:d0 and slotNo: 0  
1 Fri Apr 3 13:13:38 2009 Decrypt errors occurred for client 00:16:ea:f0:af:68 using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9e:d0
2 Fri Apr 3 13:10:41 2009 Interference Profile Failed for Base Radio MAC: 00:1e:13:07:9f:d0 and slotNo: 0  
3 Fri Apr 3 13:09:41 2009 Decrypt errors occurred for client 00:40:96:b7:7a:97 using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9f:d0
4 Fri Apr 3 13:07:41 2009 Decrypt errors occurred for client 00:40:96:b7:7a:97 using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9f:d0
5 Fri Apr 3 12:41:41 2009 Decrypt errors occurred for client 00:40:96:b7:7a:97 using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9f:d0
6 Fri Apr 3 10:45:37 2009 Decrypt errors occurred for client 00:40:96:b6:38:56 using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9e:20
7 Fri Apr 3 01:25:41 2009 Load Profile Updated to Pass for Base Radio MAC: 00:1e:13:07:9f:d0 and slotNo: 0  
8 Fri Apr 3 01:23:41 2009 Decrypt errors occurred for client 00:40:96:b6:38:fc using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9f:d0
9 Fri Apr 3 01:17:41 2009 Decrypt errors occurred for client 00:40:96:b6:38:fc using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9f:d0
10 Fri Apr 3 01:13:41 2009 Load Profile Failed for Base Radio MAC: 00:1e:13:07:9f:d0 and slotNo: 0  
11 Fri Apr 3 01:11:41 2009 Load Profile Updated to Pass for Base Radio MAC: 00:1e:13:07:9f:d0 and slotNo: 0  
12 Fri Apr 3 01:05:41 2009 Decrypt errors occurred for client 00:40:96:b6:38:fc using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9f:d0
13 Fri Apr 3 01:01:41 2009 Decrypt errors occurred for client 00:40:96:b6:38:fc using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9f:d0
14 Fri Apr 3 00:45:41 2009 Decrypt errors occurred for client 00:40:96:b6:38:fc using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9f:d0
15 Fri Apr 3 00:35:41 2009 Decrypt errors occurred for client 00:40:96:b6:38:fc using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9f:d0
16 Fri Apr 3 00:31:41 2009 Decrypt errors occurred for client 00:40:96:b6:38:fc using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9f:d0
17 Fri Apr 3 00:25:41 2009 Decrypt errors occurred for client 00:40:96:b6:38:fc using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9f:d0
18 Fri Apr 3 00:23:41 2009 Decrypt errors occurred for client 00:40:96:b6:38:fc using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9f:d0
19 Fri Apr 3 00:19:41 2009 Decrypt errors occurred for client 00:40:96:b6:38:fc using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9f:d0
20 Fri Apr 3 00:17:41 2009 Decrypt errors occurred for client 00:40:96:b6:38:fc using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9f:d0
21 Fri Apr 3 00:09:41 2009 Decrypt errors occurred for client 00:40:96:b6:38:fc using WPA2 key on 802.11b/g interface of AP 00:1e:13:07:9f:d0
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Question by:ctna
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Donboo earned 500 total points
ID: 24067923
What version of the WLC are you running?
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Author Comment

by:ctna
ID: 24124656
Reconfigured LAG - Sorry for delay in Posting
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Author Closing Comment

by:ctna
ID: 31566380
Thank for being only person to respond.
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Expert Comment

by:imsaguy
ID: 24264238
What do you mean you reconfigured your LAG?  We're having the same issues.  Right now I have my LAG setup for mirroring.  
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Expert Comment

by:DM006
ID: 31749521
I have eth same problem and don't even use LAG... I have all 1140's running on 4402's with 6.0.196 software...
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Expert Comment

by:cmhtech
ID: 32864158
Anybody ever find a real solution to this problem?  We just upgraded to 6.0.196.0 and are having the same decrypt errors.
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Expert Comment

by:imsaguy
ID: 32865510
Nope.
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