This could be a complicated problem to solve, as there are several possible causes for it.
Back up all data, then take each of the following steps that you haven't already taken. Stop when the problem is resolved.
Step 1
From the menu bar, select
▹ System Preferences... ▹ Date & Time
Select the
Time Zone tab in the preference pane that opens and check that the time zone matches your location. Then select the
Date & Time tab. Check that the data and time shown (including the year) are correct, and correct them if not.
Check the box marked
Set date and time automatically
if it's not already checked, and select one of the Apple time servers from the menu next to it.
Step 2
Triple-click anywhere in the line below on this page to select it:
/System/Library/Keychains/SystemCACertificates.keychain
Right-click or
control-click the highlighted line and select
Services
▹
Show Info
from the contextual menu.* An Info dialog should open. The dialog should show "You can only read" in the
Sharing & Permissions section.
Repeat with this line:
/System/Library/Keychains/SystemRootCertificates.keychain
If instead of the Info dialog, you get a message that either file can't be found,
reinstall OS X.
*If you don't see the contextual menu item, copy the selected text to the Clipboard (
command-C). Open a TextEdit window and paste into it (
command-V). Select the line you just pasted and continue as above.
Step 3
Launch the Keychain Access application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Keychain Access in the icon grid.
In the upper left corner of the window, you should see a list headed Keychains. If not, click the button in the lower left corner that looks like a triangle inside a square.
In the
Keychains list, there should be items named
System and
System Roots. If not, select
File
▹
Add Keychain
from the menu bar and add the following items:
/Library/Keychains/System.keychain
/System/Library/Keychains/SystemRootCertificates.keychain
From the
Category list in the lower left corner of the window, select
Certificates. Look carefully at the list of certificates in the right side of the window. If any of them has a a blue-and-white plus sign or a red "X" in the icon, double-click it. An inspection window will open. Click the disclosure triangle labeled
Trust to disclose the trust settings for the certificate. From the menu at the top, select
When using this certificate: Use System Defaults
Close the inspection window. You'll be prompted for your administrator password to update the settings. Revert all the certificates with non-default trust settings.
Never again change any of those settings.
Step 4
Select My Certificates from the Category list. From the list of certificates shown, delete any that are marked with a red X as expired or invalid.
Export all remaining certificates, delete them from the keychain, and reimport. For instructions, select
Help
▹
Keychain Access Help
from the menu bar and search for the term "export" in the help window. Export each certificate as an individual file; don't combine them into one big file.
Step 5
From the menu bar, select
Keychain Access ▹ Preferences ▹ Certificates
There are three menus in the window. Change the selection in the top two to Best attempt, and in the bottom one to CRL.
Step 6
Triple-click anywhere in the line of text below on this page to select it:
Copy the selected text to the Clipboard by pressing the key combination command-C. In the Finder, select
from the menu bar and paste into the box that opens (command-V). You won't see what you pasted because a line break is included. Press return.
A folder named "crls" should open. Move all the files in that folder to the Trash. You’ll be prompted for your administrator login password.
Step 7
Reboot, empty the Trash, and test.
