Apple’s SSL certificate that is responsible for verifying and authenticating connections to Apple’s Mac App Store software update servers has expired, causing the Mac App Store to issue errors like those above. Another error notification points to the swscan.apple.com¬†server as being the issue, below.

Server-cert-error

 

A quick search shows that this SSL certificate expired yesterday May 24th at midnight.

Screenshot 2014-05-25 13.11.59

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