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Date: Thu, 14 Mar 2019 17:56:52 +0300
From: Andrey Repin <anrdaemon AT yandex DOT ru>
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Message-ID: <1365721707.20190314175652@yandex.ru>
To: renaud DOT rolles AT giraudbtp DOT com, cygwin AT cygwin DOT com
Subject: Re: sshd: fatal: seteuid XXX : No such device or address
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Greetings, renaud DOT rolles AT giraudbtp DOT com!

>> Please remove /etc/passwd and /etc/group files. They are no longer
>> necessary, unless you have some very special needs, and even then, they
>> only needed for that one or two accounts you need special treatment for.

> They dont exists.

Then my next guess is that you'll have to reestablish your trust with
`passwd -R`. There's not many places where and what can be "saved" :)

>> The main security concern is, why your Administrator user:
>> 1. have password, and
>> 2. is not disabled?

> Why would i disable Administrator, it's the only local account, the server
> isn't in any domain and without password it doesn't seem secure at all.

Create a different local account, with necessary password and permissions,
then reset password on local Administrator account and disable it.

As for why, Administrator is the only local account with super-user
permissions that is guaranteed to exist. Windows uses it in case something
gone REALLY wrong, such as AD database recovery procedures.

It is easy enough to enable a locked account with offline tools, if your system
gone into such disrepair, that you can no longer even boot it, and need a
LiveCD to login to local SAM environment.
But recovering a lost Administrator password is a nontrivial endeavor, and
chances to brind system into a working state without complete reinstall are
diminishing rather quick.


-- 
With best regards,
Andrey Repin
Thursday, March 14, 2019 17:49:16

Sorry for my terrible english...


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