Fix #1: Open Keychain and delete the Unknown certificate.The 10.7.2 update also prevents Keychain Access from loading. Fix #2: Delete ~/Library/Keychains/login.keychain and /Library/Keychains/System.keychain. This temporarily resolves the issue, and lets you load secure sites, but a minute or two after rebooting or hibernating somehow magically undoes the fix, so you have to delete these files over and over.
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Firefox seems to get around things and if you don't want to do anything at all, you can turn off OCSP in Firefox (about:config) just to login to your wireless portal, and then remember to turn it back on.
I'm happy to inform now that in my case, the problem has (hopefully) disappeared!