[Samba] Winbind, cached logons and 'user persistency'...

[Marco Gaiarin]

I've noted that some weeks ago, but i was upgrading all my PVE cluster
so i've considered it benevolent.

Yesterday i've updated my main switch, disconnecting for a brief lag of
time all my ''infrastructutes''.

My SMTP server (exim) start to complain about 'unroutable addresses':

 2019-01-16 18:32:40 1gjp3Q-0006aw-TG <= root at sv.lnf.it H=(3jane.sv.lnf.it) [10.5.1.13] P=esmtp S=655 id=20190116173240.C20003CE035A at 3jane.sv.lnf.it
 2019-01-16 18:33:45 1gjp3Q-0006aw-TG ** gaio at fvg.lnf.it <root at sv.lnf.it> F=<root at sv.lnf.it>: Unrouteable address

my SMTP server is a DM, configured with winbind and cached/offline
logons. SMTP server use 'nss' as final delivery rules (eg, user that
exist in NSS are delivered).
After some minutes i've reconnected and powered up the new switch, and
all come back as usual.


So seems that disconnecting temporarly the DM from the DCs, lead to
'user not found' error, like as users ''desappear'' from NSS.
In winbind logs nothing get printed.


Why?!

-- 
dott. Marco Gaiarin				        GNUPG Key ID: 240A3D66
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