How to clear Safari SSL client certificate cache?
I have two SSL client certificates which I can use to access an Apache web server via Safari. Let's call them Cert-A and Cert-B. I can use either certificate to authenticate. When I first accessed the web server, a selection dialog popped up and I chose Cert-A for authentication. Now whenever I access the web server, Safari no longer displays a selection dialog, but automatically uses Cert-A. Thus, I cannot switch to Cert-B.
I have deleted all web objects and cookies via Safari preferences, I have cleared my ~/Library/Caches directory, I have rebooted the machine -- it does not make a difference. How can I force Safari to display the certificate selection dialog again? Is there a special certificate cache I can clear?
Thanks for your suggestions.
MacBook Pro with Retina display, OS X Mountain Lion (10.8.2)