I have found this to be the most effective workaround.  I haven't tried 
Step 1 (Preferred) yet.

http://resnet.southernct.edu/error_messages/network_error_ssl_certicate_rev_failed_12057.php



Osborne, Bruce W. (NS) wrote:
> We have found that Step 2b solution does not work reliably. If you use
> Step 2a, you must select the trusted root store in IE7. It will not
> automatically put the certificate into that store.
>
> Bruce Osborne
> Liberty University
>
> -----Original Message-----
> From: Cisco Clean Access Users and Administrators
> [mailto:[log in to unmask]] On Behalf Of Dale Harville
> Sent: Friday, September 21, 2007 10:32 AM
> To: [log in to unmask]
> Subject: Re: [CLEANACCESS] Revocation message with Vista and IE7
>
> Just got this from TAC:
> Here is an explanation and workaround to this problem:
> http://www.cisco.com/en/US/products/ps6128/prod_release_note09186a008085
> b16f.html#wp113835
>
> I have tested this and it does resolve the issue.
> TAC Case# 606895865
>
> Dale Harville
> Network Administrator
> Infrastructure Operations
> Galveston College Information Technology
> 4015 Ave Q
> Galveston, TX. 77550
> Voice: (409) 944-1356
> Fax: (409) 944-1356
> Email: [log in to unmask]
> Monday-Friday 8:00am - 5:00pm CST
> "Try not to become a man of success, but rather try to become a man of
> value."   Albert Einstein
>
> -----Original Message-----
> From: Cisco Clean Access Users and Administrators
> [mailto:[log in to unmask]] On Behalf Of Stanclift, Michael
> Sent: Friday, September 21, 2007 8:53 AM
> To: [log in to unmask]
> Subject: Re: Revocation message with Vista and IE7
>
> There is an option in IE7 under the security settings that you can turn
> off that is something to the effect of "check for security certificate
> revocation" that will stop the error from showing up. We have the same
> problem though and have not been able to figure out why it happens.
>
> I don't think the option is even available in IE6 and in IE7 on XP I
> think it's already turned off by default.
>
>
> Michael Stanclift
> Network Analyst
> Rockhurst University
>
> Conway Hall, Office 415
> 1100 Rockhurst Road
> Kansas City, Missouri 64110
> (816) 501-4231
>
>
> -----Original Message-----
> From: Cisco Clean Access Users and Administrators
> [mailto:[log in to unmask]] On Behalf Of Dale Harville
> Sent: Friday, September 21, 2007 8:34 AM
> To: [log in to unmask]
> Subject: Revocation message with Vista and IE7
>
> I have Clean Access Version 4.1.2.1 running in-band mode.  Whenever a
> student with a Windows Vista laptop running IE7 connects and after the
> password has been verified, they get a message "Revocation Information
> for the security Certificate for this site is not available.  Do you
> want to proceed?" No mater how many times they hit yes, they never get
> past this screen.  IF they close the box, they are thrown into the
> temporary access group.  Laptops running Windows XP and IE6 work just
> fine.  Any idea why this is?
>
> Dale Harville
> Network Administrator
> Infrastructure Operations
> Galveston College Information Technology
> 4015 Ave Q
> Galveston, TX. 77550
> Voice: (409) 944-1356
> Fax: (409) 944-1356
> Email: [log in to unmask]
> Monday-Friday 8:00am - 5:00pm CST
> "Try not to become a man of success, but rather try to become a man of
> value."   Albert Einstein
>