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Verifying or Validating Server Certificate when using WPA/WPA2 and 8021x WLAN
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Our wireless network consists of a two Cisco wireless controller, 240 APs and we use Cisco ACS 5.2 as our RADIUS server. One of our wireless networks is configured to use WPA/WPA2 with 802.1x and PEAP w/ MSCHAP v2. After updating the server certificate on the ACS, our wireless users were asked to verify or validate the server certificate before gaining access to the wireless network. This requirement generates numerous helpdesk tickets and many more questions as to why the users must do this, when they don’t have to do it on any other wireless network. I have asked Cisco for assistance but they informed me that what we are seeing is the normal behavior for the wireless supplicants and that the user must manually verify the authentication server certificate when a wireless profile is created for the first time or after the server certificate is changed on the ACS.
I know we are not the only one seeing this requirements, numerous other University have publish wireless tutorials asking their user to verify the certificate as part of the initial setup of the wireless profile. I know we can eliminate this requirement in Windows machines by just unchecking the validate certificate option, but this is not an option on iOS machines. We use the 3rd party certificate by Incommon and have install both intermediate and root certificate on the ACS.
Has anyone found a solution to this problem? Or is this just the default behavior of the supplicant that we are seeing?
Thank you for your assistance.
Michael M. Williams
Network Systems Analyst
Information Technology Services
Tarleton State University
201st St. Felix Str.
Stephenville, TX 76402
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