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Date: Thu, 14 Mar 2019 13:10:34 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: renaud DOT rolles AT giraudbtp DOT com
Cc: cygwin AT cygwin DOT com
Subject: Re: sshd: fatal: seteuid XXX : No such device or address
Message-ID: <20190314121034.GG3785@calimero.vinschen.de>
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On Mar 14 12:39, renaud DOT rolles AT giraudbtp DOT com wrote:
> Hello the list,=20
>=20
> Thanks for all the work and effort put into this.
> Since two days i cannot login anymore (password less) with ssh into my
> server
>=20
> Server is :=20
> Microsoft Windows Server 2012 R2 Essentials / 6.3.9600 N/A version 9600
>=20
> Cygwin was not up to date, but I have since updated it
> CYGWIN_NT-6.3 [MACHINE NAME] 3.0.3(0.338/5/3) 2019-03-09 19:12 x86_64 Cyg=
win
>=20
> I can login via password, it work and lets me in.
> But if i tried with my keys, I get in the event viewer :
> sshd: PID 3777: fatal: seteuid 1049076: No such device or address
>=20
> I tried googling around, reinstalled multiple times sshd, the user and the
> service with no luck so far.
> I was working for several years now.
>=20
> For now I have no clue, so i'm asking what did I do wrong ?

You should try two things:

- Make sure to login with the Administrator account case-sensitive.
  If your account is called "Administrator", then use an uppercase
  'A' when logging in.

  This case-sensitivity issue is a temporary workaround for a
  potential security problem in OpenSSH.  This will be rectified
  with OpenSSH 8.0 which allows to login case-insentive again.

- If that doesn't help, switch the user running the sshd service from
  "cyg_server" to SYSTEM (the services GUI calls it "LocalSystem")

  Cygwin switched the logon method and this method doesn't run
  under the "cyg_server" account sometimes.  However, switching
  back to "LocalSystem" instead of having to create a special
  "cyg_server" service account is one of the advantages of the
  new logon method.  For details, see

  https://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-nopasswd1


HTH,
Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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