Guest Roman Posted August 29, 2007 Posted August 29, 2007 Hi there, I've got a curious problem regarding client certificates. I'm using Windows 2003 Server Certificate Authority client certificates for a web application to limit access to a web application. I've also created the client certificates from the standard 'User' certificate template. The problem I've got is that for a while all users could use the app fine with these certificates in place, however over the past month or two only some users report that they can't get into the web application and they get a "Page Cannot Be Displayed" error message (client machines are Windows XP tablet edition running IE 6 SP2). I've checked their machines and the certificates are still there and haven't expired (nor have they been revoked). If I remove the certificate then I get the expected "Page requires a client certificate" error message. If I then create another client certificate on the machine it then works fine, but after a random period of time it stops working again. Every user is allocated their own certificate and out of 20 users only the same 5 or 6 people seem to be having this issue. I found this Microsoft Knowledgebase article and thought that this may help... http://support.microsoft.com/kb/811383 However it says that the issue occurs on IE 6 SP1, plus I've also upgraded some of these machines to IE 7 and its still happening. I'm not really sure where to start looking for a solution so any suggestions would be appreciated. Thanks.
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