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intel iMac running Snow Leopard 10.6.4. There are several user accounts on this computer, only one of which cannot access https sites. Safari eventually displays the message:

Safari can’t open the page [url goes here] because Safari can’t establish a secure connection to the server

Firefox and chrome also fail to display the pages, but they don't give an error message.

I have searched SuperUser, Apple Support, and Google, and I have found many posts but few solutions. I did try installing a new root certificate from Thawte as recommended in one of the posts, but that did not solve the problem.

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So, this is for ALL https sites? And not in Firefox or another browser? – Arjan Aug 15 '10 at 13:18
@Arjan - "Firefox and chrome also fail to display the pages" – Chris Aug 15 '10 at 15:03
all https sites as far as I can tell. Cannot load the pages in Firefox or chrome either. – Scott Aug 15 '10 at 15:04
@Chris, ooops, you're right! Can I blame that ugly scrollbar for that then? ;-) – Arjan Aug 15 '10 at 15:20

I have to admit I don't know if the current versions of Firefox or Chrome use the keychain for SSL. If they don't, the following probably won't help, but you could try running keychain first aid and/or resetting the Keychain.

The quick fix may be to delete and recreate the user account (after backing up their data, of course).

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The keychain stuff did not work, so I did the quick fix - gets rid of the symptom, but doesn't help me understand the problem. Thanks – Scott Aug 17 '10 at 2:25

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