But as the top comment says: The actual issue was that some developers used an old version of OpenSSL, which couldn&#x27;t handle the SHA2 cert. Apple apparently &quot;deprecated&quot; their SHA1 cert and started to use an SHA2 cert. IIRC some apps were still working because they used the right OpenSSL version.<p>I guess Apple didn&#x27;t communicate enough with the developers that they&#x27;ll start using SHA2.