samba - Feb 2016 - Samba after upgrade+migration, Win7 workstation trusts lost

Hello list -

 

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Huh? I am extremely confused. I'll need to slog through quite a bit of log
data, but this makes no sense to me at all.

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Samba is creating log.[ip address] and log.[machine name]; what's the
relationship between the two, and in which should I be looking for
authentication attempts?