[Samba] Samba Crashes on AD DC if "unix extensions" is Enabled

[John R. Graham]

/var/log/messages shows:

     Dec  5 08:33:45 ceres smbd[12109]: smbd version 4.21.1 started.
     Dec  5 08:33:45 ceres smbd[12109]:   Copyright Andrew Tridgell and 
the Samba Team 1992-2024
     Dec  5 08:33:45 ceres samba[12095]: [2024/12/05 08:33:45.176096,  
0] ../../source4/samba/server.c:403(samba_terminate)
     Dec  5 08:33:45 ceres samba[12095]:   samba_terminate: 
samba_terminate of samba 12095: kdc failed to setup interfaces
     Dec  5 08:36:52 ceres /etc/init.d/samba[12570]: status: crashed

Is this another of those, "I told you not to have shares on your DC!" 
situations? (Moving away from them. Promise.)

- John