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Date: Fri, 12 Jun 2026 17:19:24 +0200
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Subject: Re: Fwd: BUG?!: Running cygserver switches egid/primary group to
 4095(CurrentSession)
To: The Cygwin Mailing List <cygwin@cygwin.com>
From: Lionel Cons via Cygwin <cygwin@cygwin.com>
Reply-To: Lionel Cons <lionelcons1972@gmail.com>
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On Thu, 11 Jun 2026 at 11:44, Mark Geisert via Cygwin <cygwin@cygwin.com> wrote:
>
> Hello Lionel,
>
> On 6/8/2026 3:35 PM, Lionel Cons via Cygwin wrote:
> [...]
> > If I run without cygserver id -a returns
> > $ id -a
> > uid=197620(lcons) gid=197121(Kein)
> > groups=197121(Kein),197615(docker-users),545(Benutzer),559(Leistungsprotokollbenutzer),4(INTERAKTIV),66049(KONSOLENANMELDUNG),11(Authentifizierte
> > Benutzer),15(Diese Organisation),113(Lokales
> > Konto),4095(CurrentSession),66048(LOKAL),262154(NTLM-Authentifizierung),401408(Mittlere
> > Verbindlichkeitsstufe)
> >
> > but if I start cygserver each new session has gid=4095(CurrentSession)
> > as egid/primary group for new terminals
> > $ id -a
> > uid=197620(lcons) gid=4095(CurrentSession)
> > groups=4095(CurrentSession),197121(Kein),197615(docker-users),545(Benutzer),559(Leistungsprotokollbenutzer),4(INTERAKTIV),66049(KONSOLENANMELDUNG),11(Authentifizierte
> > Benutzer),15(Diese Organisation),113(Lokales
> > Konto),66048(LOKAL),262154(NTLM-Authentifizierung),401408(Mittlere
> > Verbindlichkeitsstufe)
>
> I'm unable to reproduce the issue, but I'm a little unsure I have the
> complete list of steps to do so.  Let's start with these questions:
>
> Is your system part of a Windows domain?

No, this is a test installation, Windows 10, standalone, IPv4-only

>
> How exactly are you starting cygserver?

Enabled it as service with autostart, reboot.

>
> When you say "each new session" do you mean opening a new Cygwin
> Terminal that presents the usual bash+mintty user CLI?  Or is it some
> other method?

Yes, just start a new mintty process each time, and not one mintty
process sharing multiple windows.

Lionel


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