On Tue, Aug 5, 2025 at 3:27 PM ben-xD via via Cygwin <[email protected]> wrote: > > [sending on behalf of *ben-xD* , redirected from > https://github.com/mintty/mintty/issues/563#issuecomment-3155007226] > > Dear Cygwin mailing list, > > I'd previously been happily using Cygwin on a non Azure AD enrolled > machine, but am now setting up a machine that is enrolled. > > The problem is some packages fail to install due to permissions > issues when I first launch the Cygwin |setup-x86_64.exe|. |126| is a > permissions error code: > > Screenshot: > > https://github.com/user-attachments/assets/bf156f43-69d9-4ef7-aa01-0f0c8a80c44a > > As soon as I launch Cygwin, I see > > -bash: /usr/bin/hostname: Permission denied > > |bash -l| also fails: > > $ bash -l > bash: /usr/bin/hostname: Permission denied > > |find| fails: > > $ /usr/bin/find > bash: /usr/bin/find: Permission denied
That sounds like a Microsoft Defender problem, which - depending on settings - blocks *.exe which have system tools with the same name in $PATH. Example: ---- snip ---- $ which -a hostname /usr/bin/hostname /cygdrive/c/Windows/system32/hostname ---- snip ---- Defender thinks that /usr/bin/hostname tries to impersonate /cygdrive/c/Windows/system32/hostname, and therefore blocks it's execution. Could you please try whether this fixes the problem for you (see https://learn.microsoft.com/en-us/defender-endpoint/attack-surface-reduction-rules-reference section "Block use of copied or impersonated system tools"): $ powershell -Command 'Set-MpPreference -AttackSurfaceReductionRules_Ids C0033C00-D16D-4114-A5A0-DC9B3A7D2CEB -AttackSurfaceReductionRules_Actions Disabled # ... and please respond back to the list whether it worked, because this more or less has become a candidate for the Cygwin FAQ... ;-( ---- Bye, Roland -- __ . . __ (o.\ \/ /.o) [email protected] \__\/\/__/ MPEG specialist, C&&JAVA&&Sun&&Unix programmer /O /==\ O\ TEL +49 641 3992797 (;O/ \/ \O;) -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
