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As mentioned in the Intro to Cygwin page, Cygwin is able to give POSIX binaries the ability to authenticate to the Windows SID subsystem.


To take advantage of this feature for:

SSH authentication[]

Install the OpenSSH daemon according to SSHD

Be sure to set the CYGWIN variable for the daemon to 'ntsec'

Windows usernames with spaces[]

According to the Cygwin FAQ , these usernames will cause problems for Cygwin. Avoid using them.

From the official Cygwin documentation[]

Using Windows security in Cygwin

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