-> click Firefox button and click Exit

Start Firefox in Safe Mode by Holding down the Option key while starting your Mozilla application.

As an alternate method, go to Utilities (in the Applications folder) and open Terminal, then run:

    /Applications/Firefox.app/Contents/MacOS/firefox-bin -safe-mode 

-> Firefox Safe Mode window will appear. DON'T SELECT ANY OPTIONS, just click Continue in Safe Mode

Firefox will open up with just basic Firefox. Check if its working while you are in Safe Mode.

Clear your cache:

Tools --> Options --> Advanced --> Network, Clear Now

You'll have to find out what certificate you need to add the example below imported a certificate for StarField

https://certificates.starfieldtech.com/repository/valicert_class2_root.crt

How to update Certificate Authority? • mozillaZine Forums

Open Tools > Options menu.

Go to the "Advanced" category and find the "Certificates" section.

Click the "Manage Certificates" button

Go to the "Authorities" tab

Click the "Import" button -- Load the file you saved.

http://forums.mozillazine.org/viewtopic.php?f=38&t=196101&start=0&st=0&sk=t&sd=a

Maybe you can find the certificate you need in Safari unless someone who has an air card or guesses what certificate you need has an answer.

• http://en.wikipedia.org/wiki/Certificate_authority
• http://www.dmoz.org/Computers/Security/Public_Key_Infrastructure/PKIX/Tools_and_Services/Third_Party_Certificate_Authorities/

I followed your suggestion, but got the same error message. By the way, I'm on a Mac Book Pro. This all seems to have started this weekend when I was away from my DSL and using an air card. Any other thoughts? Thanks!

Did your problem occurred when you started Firefox in Safe Mode ?? (as suggested in my first post)

Check again and tell if its working.

Yes, I had the same problem when I opened FireFox in safe mode. And I got to safe mode from Terminal.

-> If the problem still occurs in Safe Mode, see these:

• Basic Troubleshooting https://support.mozilla.com/en-US/kb/Basic%20Troubleshooting

• Troubleshooting Plugins https://support.mozilla.com/en-US/kb/Troubleshooting%20plugins

• Resetting Preferences https://support.mozilla.com/en-US/kb/Resetting%20preferences

Check and tell if its working.

I see the same error message, so it seems that the certificate has already been revoked (Expires: Friday 5 August 2011), but hasn't been replaced yet by a new certificate.

A possibility is to disable the revoke check temporarily to make the site load.

• Firefox > Preferences > Advanced : Encryption: Certificates -> Validation

Cor-el, I followed your Preferences suggestions, but am not sure what to choose next. Currently checked: "Use the OCSP to confirm the current validity" or shall I check "Validate all certifications using "Bultin Object Token: Microsec e-Szigno Root CA?

You can uncheck "Use the OCSP to confirm the current validity"
That should allow to access the site.

Make sure that you undo the change after you are done with the site and tick the box to check the certificates online.

You can contact the website and inform them about this issue.

• http://kb.mozillazine.org/OCSP_error_when_accessing_secure_sites

Thanks Cor-el, I got a msg from the site today saying the certificate looked suspicious and asking if I wanted to make an exception. I'm in! Appreciate your help.