Invalid Certificate on every secured website

Sorry to hear that. I also thought none of the certificates had the BLUE + sign, but when I very carefully followed step 2 in the link http://b.rthr.me/wp/?p=356 I found one, and then had to unlock the Keychain window and follow step 3. I too spent 2 days trying all the other solutions and then going back and doing this one more time. The rest of Mountain Lion works fine! If you have another Mac, you can transfer the Mountain Lion installer image to a bootable 8GB thumb drive to use for your installation. (ref Macworld)

FOUND IT!!! Yesss, I finally fixed my problem by following the advice given here by pckizer:

https://discussions.apple.com/thread/4030390?answerId=18691477022#18691477022

Entering all the adresses to the Proxy exclude list fixed all the problem and now App Store is back and running + all sites previously unavailable. **** YEAH!!!!!!!

It can helps if you are able access internet without proxy (why you have proxy in this case anyway ?)

If you have to use proxy, you are still doomed

This solved a close problem with different symptom: impossible to log in the MAS. Same message in the log. After cleaning all "+" certificates, everything is correct. Thanks !

thank you SO much for this tip - I haven't been able to get on Twitter or Bank of America in months and months. Hoping that it keeps working!

wow my problem was incorrect date settings!

thank you!

I have the same issue but from my home's wi-fi. both my iMac and macBook get the same message

I've been having the same problem for over a year now on my 5 year old Dual 2ghz MPB.

With and without proxy!

Apple mail is so terrible for us that we've all tried swapping to Thunderbird and had better luck, with this less intuitive program; no more forgetting passwords or 'invalid certificate' messages.

Clue?:

Private servers have certificate and 'rejectedf password' problems

Gmail is fine!

Hotmail is fine!

Tis a long string of problems that are building up with apple software.

Solved my problem, too.

Having the same issue with non stop invalid certificates warning(no proxy) I solved it by simply setting the time and date of the computer(snowleopardmacbook) to "automatic". It seems that for some reasons the date and time of my computer were not set to more than 10 hours late and more than one year ago. Setting the time solved completely the situation.

Also the software update app can not operate properly, would give errors and warnings and do not install updates at all if the time and date is wrong.

I considered it is good to be known.

I didn't have any blue +'s, is that normal?

Just cannot seem to find any certificates with a blue + !!

Ok so the way you fix it is you go to settings and disconnect your wifi "forget this network" is the button. Then reconnect it using your WEP code or watever you wanna call it. Then it should work.🙂

I found this entry doing a google search, and wanted to add what we did that fixed the problem as I didn't see it here.

My wife recently purchased a new apple product, after having it configured with Apple, her personal email account no longer functioned. Support suggested after looking at our settings that it was our network, which didn't make sense as we have several other devices all working correctly on the network.

Our personal email is run from our own server. It is a server that I maintain at an ISP, which has a few email addresses and domains on it. As such it has a self-signed SSL/TLS certificate. The problem was that the new computer did not trust the certificate. In order to fix the problem, we had to go into the Keychain access application on her device, find the SSL certificate, edit that certificate and set it to "Always Trust" that certificate. This resolved the issues.

Important to note that at first connection doctor said 'it could not connect'. This was false, as the server showed it connecting just fine, but not sending.

Hope that helps people.

-mike.

If you have messed the date and time to play games to earn lives this is your problem set date and time correctly will fix your problem