From version 12.2.2 I get the error message 'We could not complete your iTunes store request an unknown error has occurred then it says (-50) then (-42408) or visa versa. This means I cannot log in, check for available downloads or listen to music
Cannot sign in, authorize computer, deauthorize computer, view my account, check available downloads
iMac (27-inch, Late 2012), OS X Yosemite (10.10.5)