ITunes won't connect to iTunes Store with my Apple ID and repeatedly crashes with "An unknown error occurred (-50)."

I've been unable to use iTunes for over 3 weeks now.
Initially, it would prompt me to Sign In with my Apple ID and password each time it tried to start, and when I clicked Sign In, it'd respond with variations of:
    "Your device or computer could not be verified. Contact support for assistance."
    or
    De-authorize/Authorize.
Frustrated, I'd click Cancel, and it'd crash with:
    "An unknown error occurred (-1008)."
    or
    "An unknown error occurred (-50)."
More recently, I don't even get the Sign In prompt any more. iTunes now just crashes immediately with unknown error (-50) as soon as it tries to start.
It is clear that this issue has more to do with the Apple ID than with iTunes specifically, because some of the apps I purchased directly from the App Store (OmniFocus, Fantastical and Forismatic) now prompt me to Sign In with my Apple ID and password each time they try to start, and they never did before. And when I try to sign, they respond with the error:
     "Your device or computer could not be verified. Contact support for assistance."
Apparently, this is an issue a whole lot of people are experiencing, judging by the long list of Google search returns on the subject; but I'm yet to find a definitive, "official" Apple solution to the problem.
My Apple ID is the same as it's always been.
If anyone knows what's really causing this and/or can offer a fix, please H-E-E-E-L-P? I'll even pay to make it go away. I abandoned Windows after 26 years, only to discover that no platform is spared the blackhole of unknown errors.
-- Chima.

iTunes: Advanced iTunes Store troubleshooting - http://support.apple.com/kb/TS3297 > Specific Conditions and Alert Messages: (Mac OS X / Windows) - includes list of iTunes error codes

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