Help finding a solution for users not able to connect to internet!!

[dbarron01]

Im working on a case where an AP is allowing only a certain amount of users to successfully access the AP.  the AP was working correctly and good until just recently.

users can associate just fine to the AP however the access to the internet is restricted and DNS wont seem to resolve.  i am working this remotely and any additional places to start looking would be much appreciated.

thank you for the support with this!!

[Leo Laohoo]

Please provide more information.  

1.  Are the affected users getting a valid IP address? 

2.  What band are users on? 

3.  What is the RSSI?  SNR?  CU? 

4.  Co-Channel Interferrence?

5.  Autonomous or controller-based? 

6.  What is the firmware/IOS version? 

7.  Model of the APs?

[dbarron01]

1.  Yes, all users are successfully obtaining IP address

2.  2.4ghz

3.  RSSI:  -52; SNR:45

4.  none found

5.  controller-based

6.  8.1.122.0

7.  AIR-CAP3702I-A-K9

[Leo Laohoo]

2.  2.4ghz

What about 5.0 Ghz radio?

3.  RSSI:  -52; SNR:45

Pick an AP and post the complete output to the WLC command "sh ap auto-rf 802.11b <AP name>".

4.  none found

"none found" or is CleanAir disabled/enabled?

[dbarron01]

Leo,

i appreciate you assisting me with this.  after working with customer we were able to find the root issue has to do with a windows cert that had expired.  the users that restarted/shutdown their devices were effected by this expiration

this was driving me crazy it was like looking for a problem but glad were on the right track

thank you Again!!!