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  • What's the output of grep -E '^(passwd|group):' /etc/nsswitch.conf? Commented Aug 17 at 11:13
  • 1
    I'd do some strace -tt -ff -o some-file on the sshd process to see what it's doing. Commented Aug 17 at 11:15
  • @StéphaneChazelas passwd: files systemd winbind group: files systemd winbind Commented Aug 17 at 11:52
  • That's most likely down to queries to winbind for group membership which may timeout for some reason (like the Microsoft domain controller not being reachable) Commented Aug 17 at 12:51