https://support.apple.com/en-us/HT205360
It's dated 10/21/2015, so maybe it addresses the issues your ISP was citing.
(I installed it just after upgrading to El Capitan on 10/22.)
HTH. Good luck!
Cheers,
Scott.
It's dated 10/21/2015, so maybe it addresses the issues your ISP was citing.
(I installed it just after upgrading to El Capitan on 10/22.)
HTH. Good luck!
Cheers,
Scott.