I\'m fairly new to github and git, but I do have git setup on my Mac (using Mavericks) and have added a repo on github. I\'m using MAMP and working on a Drupal site, and when I
I recently (Jul 2014) had a similar issue and found on OS X (10.9.4) that there was a "DigiCert High Assurance EV Root CA" certificate had expired (although I had another unexpired one as well).
Keychain AccessCertificates for "DigiCert"View menu > Show Expired CertificatesI found two certificates named "DigiCert High Assurance EV Root CA", one expiring Nov 2031 and the expired one at July 2014 (a few of days previously). Deleting the expired certificate resolved the issue for me.
Hope this helps.