I want to install openssh using cygwin. I ran ssh-host-config, and I was guided through a text menu. I entered what I found on a webpage had to be entered, until I came to this point: Enter the value of CYGWIN for the daemon: [] binmode ntsec , where I accidentally hit enter before I typed it all in (yes, clumsy, fat fingers). I am not aware of the significance of binmode ntsec, but I didn't want to take any chances, so I figured I'd just delete everything and start over.
Running ssh-host-config again, however, did not behave as it did the first time. It skipped that one query. I then deleted the entire cygwin folder and reinstalled from scratch, but ssh-host-config keeps saying that Sshd service is already installed, and I don't get the chance to enter this binmode ntsec name. I found threads with tips how to remove cygwin completely, but something seems to remain behind, because ssh-host-config never behaves like it did the first time.
I have three questions:
1.) Why does ssh-host-config not behave like it did the first time, even though I delete and reinstall cygwin? It must have a memory outside of the cygwin folder?
2.) In which config file is that 'value of CYGWIN' = binmode ntsec stored?
3.) What is its significance?
You are probably reading a too old suggestion.
There is no need to set those parameters in the CYGWIN variable for sshd usage
https://cygwin.com/cygwin-ug-net/using-cygwinenv.html
Obsolete options
Certain CYGWIN options available in past releases have been removed over time for one reason or another. These obsolete options are listed below.
(no)binmode - This option has been removed because all file opens default to binary mode, unless the open mode has been specified explicitly in the open(2) call.
...
(no)ntsec - This option has been removed in favor of the per-mount option "acl"/"noacl". For more information, read the documentation in the section called “The Cygwin Mount Table”.
Additional info:
As SSHD is set as windows service, the value of CYGWIN variable, if used, is stored in the windows register at
Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cygsshd