Error -51 when trying to sync iPad to desktop

For the first time in two years showing 'error -51' when trying to sink iPad to desktop. ?

search of support.apple.com yielded a mere one result for "error 51" - archived and seemingly unrelated to anything you indicate.
help us out... tell all about your iPad and your desktop - model details, OS details, etc.
take a screenshot of the message (whole screen provides some context perhaps)
also, if you can remember anything that may have immediately preceded the misbehavior or between the last success and now.
ÇÇÇ

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