I get a few of these (v5.1MP6), mostly during high-load situations.  
Inevitably, the status 50 Duplicate job has this in (the middle of) its log:

    Warning bpduplicate ... failure logging message to client ... in log
    ...: can't connect to client (58)


cheers, wayne

dy018 wrote, in part,  on 2007-10-01 3:58 AM:
> Anyone here encounter status 50 (client process aborted) during Vaulting?
>   
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