In fact, when a service principal has requires_pre_auth set – which would normally be no-op as services don't acquire TGTs – the MIT KDC will instead treat it as a requirement for the client of that service to be strengthened using preauth.
KDC_ERR_PREAUTH_REQUIRED is returned on the initial Kerberos AS request. By default, the Windows Kerberos Client is not including pre-authentication information in this first request.
On a Ubuntu 12.04 server, I am getting the following pair of messages in auth.log several times a minute: Jan 17 22:04:25 binx sshd[14659]: Connection closed by 192.168.0.1 [preauth] Jan 17 22:04:25
Recently, My SSH log summaries for my Ubuntu 12.04 servers in Logwatch have started showing entries for "11: Normal Shutdown, Thank you for playing [preauth]" along with the "11: Bye Bye [preauth]" and "11: disconnected by user" messages they had been showing previously.
logwatch - What does "Normal Shutdown, Thank you for playing [preauth ...
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