Get random (but eventual) "lost connection" using scp (which uses sftp/sftp-server) when transferring huge files via 1G
ethernet. No problem if use "scp -O" (don't use sftp protocol) or piping through ssh. Will also happen with a local
scp via loopback (localhost) so not a network problem. Running sshd with "-ddd" shows a "write failed" and
then the connection is terminated ("chan_shutdown_write").
Latest Cygwin on Windows 10
Also Reported to openssh project.
Cygwin Configuration Diagnostics
Current System Time: Tue Jan 21 10:31:38 2025
Windows 10 Professional Ver 10.0 Build 19045
Path: C:\Windows\system32
C:\Windows
C:\Windows\System32\Wbem
C:\sys\msvs2015\Common7\IDE\CommonExtensions\Microsoft\TestWindow
C:\Program Files (x86)\MSBuild\14.0\bin
C:\sys\msvs2015\Common7\IDE\
C:\sys\msvs2015\VC\BIN\x86_amd64
C:\sys\msvs2015\VC\BIN
C:\sys\msvs2015\Common7\Tools
C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319
C:\sys\msvs2015\VC\VCPackages
C:\Program Files (x86)\Windows Kits\10\bin\x86
C:\Windows\System32\WindowsPowerShell\v1.0\
c:\sys\utils
c:\cygwin\bin
C:\sys\AMD\ATI.ACE\Core-Static
C:\sys\Git\cmd
C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common
C:\sys\MATLAB\R2023b\bin
C:\Program Files\Microsoft SQL Server\120\Tools\Binn\
C:\Program Files\Microsoft SQL Server\130\Tools\Binn\
C:\sys\AOMEI\AOMEI Backupper\7.4.2
c:\jay\bin
Output from C:\cygwin\bin\id.exe
UID: 197609(jay)
GID: 197121(None)
197121(None)
114(Local account and member of Administrators group)
544(Administrators)
559(Performance Log Users)
545(Users)
4(INTERACTIVE)
66049(CONSOLE LOGON)
11(Authenticated Users)
15(This Organization)
113(Local account)
4095(CurrentSession)
66048(LOCAL)
262154(NTLM Authentication)
405504(High Mandatory Level)
SysDir: C:\Windows\system32
WinDir: C:\Windows
PWD = '/cygdrive/c/jay'
HOME = '/cygdrive/c/jay'
ProgramFiles(x86) = 'C:\Program Files (x86)'
!:: = '::\'
CommonProgramFiles(x86) = 'C:\Program Files (x86)\Common Files'
!C: = 'C:\jay'
NUMBER_OF_PROCESSORS = '16'
FPS_BROWSER_USER_PROFILE_STRING = 'Default'
PROCESSOR_LEVEL = '26'
Platform = 'x64'
USERDOMAIN_ROAMINGPROFILE = 'JAY'
PROGRAMFILES = 'C:\Program Files'
PATHEXT = '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC'
SSH_AUTH_SOCK = 'c:\jay\.ssh\ssh_agent_socket'
OS = 'Windows_NT'
HOMEDRIVE = 'c:'
USERDOMAIN = 'JAY'
USERPROFILE = 'C:\Users\jay'
VS140COMNTOOLS = 'C:\sys\msvs2015\Common7\Tools\'
WindowsSdkDir = 'C:\Program Files (x86)\Windows Kits\10\'
include = 'C:\sys\msvs2015\VC\INCLUDE;C:\Program Files (x86)\Windows
Kits\10\include\10.0.14393.0\ucrt;C:\Program Files (x86)\Windows
Kits\NETFXSDK\4.6.1\include\um;C:\Program Files (x86)\Windows
Kits\10\include\10.0.14393.0\shared;C:\Program Files (x86)\Windows
Kits\10\include\10.0.14393.0\um;C:\Program Files (x86)\Windows
Kits\10\include\10.0.14393.0\winrt;'
ALLUSERSPROFILE = 'C:\ProgramData'
CommonProgramW6432 = 'C:\Program Files\Common Files'
dircmd = '/a/o:gne'
USERNAME = 'jay'
VBOX_MSI_INSTALL_PATH = 'C:\sys\virtualbox\'
COMSPEC = 'C:\Windows\system32\cmd.exe'
APPDATA = 'c:\jay\settings\appdata'
SYSTEMROOT = 'C:\Windows'
LOCALAPPDATA = 'c:\jay\settings\LocalAppData'
DevEnvDir = 'C:\sys\msvs2015\Common7\IDE\'
COMPUTERNAME = 'JAY'
prompt = '$p$_$_$n$g'
TERM = 'xterm-256color'
LOGONSERVER = '\\JAY'
PSModulePath = 'C:\Program
Files\WindowsPowerShell\Modules;C:\Windows\system32\WindowsPowerShell\v1.0\Modules'
TEMP = '/cygdrive/c/Users/jay/AppData/Local/Temp'
SHLVL = '1'
PROCESSOR_REVISION = '4400'
DriverData = 'C:\Windows\System32\Drivers\DriverData'
WindowsSDKLibVersion = '10.0.14393.0\'
COMMONPROGRAMFILES = 'C:\Program Files\Common Files'
libpath =
'C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319;C:\sys\msvs2015\VC\LIB\amd64;C:\Program
Files (x86)\Windows Kits\10\UnionMetadata;C:\Program Files (x86)\Windows
Kits\10\References;\Microsoft.VCLibs\14.0\References\CommonConfiguration\neutral;'
PROCESSOR_IDENTIFIER = 'AMD64 Family 26 Model 68 Stepping 0, AuthenticAMD'
SESSIONNAME = 'Console'
lib = 'C:\sys\msvs2015\VC\LIB\amd64;C:\Program Files (x86)\Windows
Kits\10\lib\10.0.14393.0\ucrt\x64;C:\Program Files (x86)\Windows
Kits\NETFXSDK\4.6.1\lib\um\x64;C:\Program Files (x86)\Windows
Kits\10\lib\10.0.14393.0\um\x64;'
WindowsSDKVersion = '10.0.14393.0\'
HOMEPATH = '\jay'
TMP = '/cygdrive/c/Users/jay/AppData/Local/Temp'
ProgramW6432 = 'C:\Program Files'
WINDIR = 'C:\Windows'
FPS_BROWSER_APP_PROFILE_STRING = 'Internet Explorer'
PROCESSOR_ARCHITECTURE = 'AMD64'
PUBLIC = 'C:\Users\Public'
SYSTEMDRIVE = 'C:'
EXECIGNORE = '*.dll'
ProgramData = 'C:\ProgramData'
_ = '/usr/bin/cygcheck'
HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin
HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin\Installations
(default) = '\??\C:\cygwin'
HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin\setup
(default) = 'C:\cygwin'
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Cygwin
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Cygwin\Installations
(default) = '\??\C:\sys\ExactAudioCopy'
obcaseinsensitive set to 1
Cygwin installations found in the registry:
System: Key: c5e39b7a9d22bafb Path: C:\cygwin
c: hd NTFS 1717966Mb 23% CP CS UN PA FC QU Win10_SSD_2TB
d: hd NTFS 953866Mb 22% CP CS UN PA FC QU Data_HD_1TB
o: cd N/A N/A
p: cd N/A N/A
s: hd NTFS 5723148Mb 14% CP CS UN PA FC QU Online_Backup_6TB
C:\cygwin / system binary,auto
C:\cygwin\bin /usr/bin system binary,auto
C:\cygwin\lib /usr/lib system binary,auto
cygdrive prefix /cygdrive user binary,noacl,posix=0,auto
Found: c:\cygwin\bin\awk
-> C:\cygwin\bin\gawk.exe
Found: c:\cygwin\bin\bash.exe
Found: c:\cygwin\bin\cat.exe
Found: C:\Windows\system32\certutil.exe
Found: C:\Windows\system32\clinfo.exe
Found: C:\Windows\system32\comp.exe
Found: C:\Windows\system32\convert.exe
Found: c:\cygwin\bin\cp.exe
Not Found: cpp (good!)
Not Found: crontab
Found: C:\Windows\system32\curl.exe
Found: C:\Windows\system32\expand.exe
Found: c:\cygwin\bin\expand.exe
Warning: C:\Windows\system32\expand.exe hides c:\cygwin\bin\expand.exe
Found: C:\Windows\system32\find.exe
Found: c:\cygwin\bin\find.exe
Warning: C:\Windows\system32\find.exe hides c:\cygwin\bin\find.exe
Found: C:\Windows\system32\ftp.exe
Not Found: gcc
Not Found: gdb
Found: c:\cygwin\bin\grep.exe
Found: C:\Windows\system32\hostname.exe
Found: c:\cygwin\bin\hostname.exe
Warning: C:\Windows\system32\hostname.exe hides c:\cygwin\bin\hostname.exe
Found: c:\cygwin\bin\kill.exe
Found: C:\Windows\system32\klist.exe
Not Found: ld
Found: c:\cygwin\bin\ls.exe
Not Found: make
Found: c:\cygwin\bin\mv.exe
Found: C:\Windows\system32\nslookup.exe
Not Found: patch
Not Found: perl
Found: C:\Windows\system32\replace.exe
Found: c:\cygwin\bin\rm.exe
Found: c:\cygwin\bin\sed.exe
Found: c:\cygwin\bin\sh.exe
Found: C:\Windows\system32\shutdown.exe
Found: C:\Windows\system32\sort.exe
Found: c:\cygwin\bin\sort.exe
Warning: C:\Windows\system32\sort.exe hides c:\cygwin\bin\sort.exe
Found: c:\cygwin\bin\ssh.exe
Found: C:\Windows\system32\tar.exe
Found: c:\cygwin\bin\tar.exe
Warning: C:\Windows\system32\tar.exe hides c:\cygwin\bin\tar.exe
Found: c:\cygwin\bin\test.exe
Found: C:\Windows\system32\timeout.exe
Found: c:\cygwin\bin\timeout.exe
Warning: C:\Windows\system32\timeout.exe hides c:\cygwin\bin\timeout.exe
Found: c:\cygwin\bin\vi.exe
Not Found: vim
Found: C:\Windows\system32\whoami.exe
Found: c:\cygwin\bin\whoami.exe
Warning: C:\Windows\system32\whoami.exe hides c:\cygwin\bin\whoami.exe
45k 2023/07/11 c:\cygwin\bin\cygargp-0.dll - os=4.0 img=0.0 sys=5.2
"cygargp-0.dll" v0.0 ts=2023-07-11 12:11
17k 2023/01/15 c:\cygwin\bin\cygattr-1.dll - os=4.0 img=0.0 sys=5.2
"cygattr-1.dll" v0.0 ts=2023-01-15 07:39
281k 2024/04/02 c:\cygwin\bin\cygblkid-1.dll - os=4.0 img=0.0 sys=5.2
"cygblkid-1.dll" v0.0 ts=2024-04-02 01:37
66k 2019/07/21 c:\cygwin\bin\cygbz2-1.dll - os=4.0 img=0.0 sys=5.2
"cygbz2-1.dll" v0.0 ts=2019-07-21 16:05
13k 2019/01/02 c:\cygwin\bin\cygcom_err-2.dll - os=4.0 img=0.0 sys=5.2
"cygcom_err-2.dll" v0.0 ts=2019-01-01 18:39
193k 2021/05/20 c:\cygwin\bin\cygcrypt-2.dll - os=4.0 img=0.0 sys=5.2
"cygcrypt-2.dll" v0.0 ts=2021-05-20 01:38
2487k 2023/09/12 c:\cygwin\bin\cygcrypto-1.1.dll - os=4.0 img=0.0 sys=5.2
"cygcrypto-1.1.dll" v0.0 ts=2023-09-12 10:36
3741k 2024/09/15 c:\cygwin\bin\cygcrypto-3.dll - os=4.0 img=0.0 sys=5.2
"cygcrypto-3.dll" v0.0 ts=2024-09-14 23:50
174k 2023/02/08 c:\cygwin\bin\cygedit-0.dll - os=4.0 img=0.0 sys=5.2
"cygedit-0.dll" v0.0 ts=2023-02-08 07:01
389k 2024/04/02 c:\cygwin\bin\cygfdisk-1.dll - os=4.0 img=0.0 sys=5.2
"cygfdisk-1.dll" v0.0 ts=2024-04-02 01:37
27k 2015/11/17 c:\cygwin\bin\cygffi-6.dll - os=4.0 img=0.0 sys=5.2
"cygffi-6.dll" v0.0 ts=2015-11-17 14:14
217k 2024/08/25 c:\cygwin\bin\cygfido2-1.dll - os=4.0 img=1.15 sys=5.2
"cygfido2-1.dll" v0.0 ts=2024-08-25 11:45
60k 2024/04/28 c:\cygwin\bin\cygformw-10.dll - os=4.0 img=0.0 sys=5.2
"cygformw-10.dll" v0.0 ts=2024-04-28 09:06
96k 2024/07/28 c:\cygwin\bin\cyggcc_s-seh-1.dll - os=4.0 img=0.0 sys=5.2
"cyggcc_s-seh-1.dll" v0.0 ts=2024-07-28 12:03
49k 2019/07/10 c:\cygwin\bin\cyggdbm-6.dll - os=4.0 img=0.0 sys=5.2
"cyggdbm-6.dll" v0.0 ts=2019-07-10 06:53
591k 2023/07/31 c:\cygwin\bin\cyggmp-10.dll - os=4.0 img=0.0 sys=5.2
"cyggmp-10.dll" v0.0 ts=2023-07-31 12:20
274k 2018/03/16 c:\cygwin\bin\cyggssapi_krb5-2.dll - os=4.0 img=0.0 sys=5.2
"cyggssapi_krb5-2.dll" v0.0 ts=2018-03-15 19:38
36k 2022/10/08 c:\cygwin\bin\cyghistory7.dll - os=4.0 img=0.0 sys=5.2
"cyghistory7.dll" v0.0 ts=2022-10-07 21:37
1063k 2022/05/23 c:\cygwin\bin\cygiconv-2.dll - os=4.0 img=0.0 sys=5.2
"cygiconv-2.dll" v0.0 ts=2022-05-23 04:22
106k 2024/02/26 c:\cygwin\bin\cygintl-8.dll - os=4.0 img=0.0 sys=5.2
"cygintl-8.dll" v0.0 ts=2024-02-26 07:39
192k 2018/03/16 c:\cygwin\bin\cygk5crypto-3.dll - os=4.0 img=0.0 sys=5.2
"cygk5crypto-3.dll" v0.0 ts=2018-03-15 19:37
754k 2018/03/16 c:\cygwin\bin\cygkrb5-3.dll - os=4.0 img=0.0 sys=5.2
"cygkrb5-3.dll" v0.0 ts=2018-03-15 19:37
37k 2018/03/16 c:\cygwin\bin\cygkrb5support-0.dll - os=4.0 img=0.0 sys=5.2
"cygkrb5support-0.dll" v0.0 ts=2018-03-15 19:36
136k 2022/10/30 c:\cygwin\bin\cyglz4-1.dll - os=4.0 img=0.0 sys=5.2
"cyglz4-1.dll" v0.0 ts=2022-10-30 09:59
172k 2024/10/03 c:\cygwin\bin\cyglzma-5.dll - os=4.0 img=0.0 sys=5.2
"cyglzma-5.dll" v0.0 ts=2024-10-03 03:42
160k 2023/01/14 c:\cygwin\bin\cygmagic-1.dll - os=4.0 img=0.0 sys=5.2
"cygmagic-1.dll" v0.0 ts=2023-01-14 13:35
298k 2024/09/15 c:\cygwin\bin\cygman-2-13-0.dll - os=4.0 img=0.0 sys=5.2
"cygman-2-13-0.dll" v0.0 ts=2024-09-15 02:58
24k 2024/09/15 c:\cygwin\bin\cygmandb-2-13-0.dll - os=4.0 img=0.0 sys=5.2
"cygmandb-2-13-0.dll" v0.0 ts=2024-09-15 02:58
29k 2024/04/28 c:\cygwin\bin\cygmenuw-10.dll - os=4.0 img=0.0 sys=5.2
"cygmenuw-10.dll" v0.0 ts=2024-04-28 09:06
650k 2023/08/22 c:\cygwin\bin\cygmpfr-6.dll - os=4.0 img=0.0 sys=5.2
"cygmpfr-6.dll" v0.0 ts=2023-08-22 10:46
337k 2024/04/28 c:\cygwin\bin\cygncursesw-10.dll - os=4.0 img=0.0 sys=5.2
"cygncursesw-10.dll" v0.0 ts=2024-04-28 09:04
1020k 2020/03/27 c:\cygwin\bin\cygp11-kit-0.dll - os=4.0 img=0.0 sys=5.2
"cygp11-kit-0.dll" v0.0 ts=2020-03-27 14:30
13k 2024/04/28 c:\cygwin\bin\cygpanelw-10.dll - os=4.0 img=0.0 sys=5.2
"cygpanelw-10.dll" v0.0 ts=2024-04-28 09:05
497k 2021/06/20 c:\cygwin\bin\cygpcre-1.dll - os=4.0 img=0.0 sys=5.2
"cygpcre-1.dll" v0.0 ts=2021-06-20 04:53
634k 2024/06/09 c:\cygwin\bin\cygpcre2-8-0.dll - os=4.0 img=0.0 sys=5.2
"cygpcre2-8-0.dll" v0.0 ts=2024-06-09 09:32
44k 2022/10/06 c:\cygwin\bin\cygpipeline-1.dll - os=4.0 img=0.0 sys=5.2
"cygpipeline-1.dll" v0.0 ts=2022-10-06 11:49
42k 2023/02/19 c:\cygwin\bin\cygpopt-0.dll - os=4.0 img=0.0 sys=5.2
"cygpopt-0.dll" v0.0 ts=2023-02-19 11:45
257k 2022/10/08 c:\cygwin\bin\cygreadline7.dll - os=4.0 img=0.0 sys=5.2
"cygreadline7.dll" v0.0 ts=2022-10-07 21:37
188k 2024/04/02 c:\cygwin\bin\cygsmartcols-1.dll - os=4.0 img=0.0 sys=5.2
"cygsmartcols-1.dll" v0.0 ts=2024-04-02 01:37
512k 2023/09/12 c:\cygwin\bin\cygssl-1.1.dll - os=4.0 img=0.0 sys=5.2
"cygssl-1.1.dll" v0.0 ts=2023-09-12 10:36
580k 2024/09/15 c:\cygwin\bin\cygssl-3.dll - os=4.0 img=0.0 sys=5.2
"cygssl-3.dll" v0.0 ts=2024-09-14 23:50
1938k 2024/07/28 c:\cygwin\bin\cygstdc++-6.dll - os=4.0 img=0.0 sys=5.2
"cygstdc++-6.dll" v0.0 ts=2024-07-28 12:10
68k 2019/07/29 c:\cygwin\bin\cygtasn1-6.dll - os=4.0 img=0.0 sys=5.2
"cygtasn1-6.dll" v0.0 ts=2019-07-28 19:12
59k 2024/04/28 c:\cygwin\bin\cygticw-10.dll - os=4.0 img=0.0 sys=5.2
"cygticw-10.dll" v0.0 ts=2024-04-28 09:04
185k 2023/07/16 c:\cygwin\bin\cyguchardet-0.dll - os=4.0 img=0.0 sys=5.2
"cyguchardet-0.dll" v0.0 ts=2023-07-16 00:19
27k 2024/04/02 c:\cygwin\bin\cyguuid-1.dll - os=4.0 img=0.0 sys=5.2
"cyguuid-1.dll" v0.0 ts=2024-04-02 01:36
88k 2024/01/27 c:\cygwin\bin\cygz.dll - os=4.0 img=0.0 sys=5.2
"cygz.dll" v0.0 ts=2024-01-27 01:12
656k 2024/04/06 c:\cygwin\bin\cygzstd-1.dll - os=4.0 img=0.0 sys=5.2
"cygzstd-1.dll" v0.0 ts=2024-04-06 05:37
2926k 2024/12/20 c:\cygwin\bin\cygwin1.dll - os=4.0 img=0.0 sys=5.2
"cygwin1.dll" v0.0 ts=2024-12-20 08:22
Cygwin DLL version info:
DLL version: 3.5.5
API major: 0
API minor: 350
Shared data: 5
DLL identifier: cygwin1
Mount registry: 3
Cygwin registry name: Cygwin
Installations name: Installations
Cygdrive default prefix:
Build date:
Shared id: cygwin1S5
Service : sshd
Display name : CYGWIN sshd
Description : sshd
Current State : Running
Controls Accepted : Stop
Command : /usr/sbin/sshd_run.sh
stdin path : /dev/null
stdout path : /var/log/sshd.log
stderr path : /var/log/sshd.log
Process Type : Own Process
Startup : Automatic
Dependencies : tcpip
Account : LocalSystem
Cygwin Package Information
Last downloaded files to: C:\sys\instpackages
Last downloaded files from: https://cygwin.mirror.constant.com/
Package Version Status
_autorebase 001091-1 OK
alternatives 1.26-1 OK
base-cygwin 3.8-2 OK
base-files 4.3-3 OK
bash 5.2.21-1 OK
bzip2 1.0.8-1 OK
ca-certificates 2024.2.69_v8.0.401-1 OK
coreutils 9.0-1 OK
crypto-policies 20190218-1 OK
csih 0.9.14-1 OK
cygrunsrv 1.64-1 OK
cygutils 1.4.17-1 OK
cygwin 3.5.5-1 OK
dash 0.5.12-5 OK
diffutils 3.10-1 OK
editrights 1.04-1 OK
file 5.44-1 OK
findutils 4.10.0-1 OK
gawk 5.3.0-1 OK
getent 2.18.90-5 OK
grep 3.11-1 OK
groff 1.23.0-1 OK
gzip 1.13-1 OK
hostname 3.13-1 OK
info 7.1-2 OK
ipc-utils 1.1-1 OK
less 643-1 OK
libargp 20230708-2 OK
libattr1 2.5.1-1.20.g0981a7bfe487 OK
libblkid1 2.39.3-2 OK
libbz2_1 1.0.8-1 OK
libcom_err2 1.44.5-1 OK
libcrypt2 4.4.20-1 OK
libedit0 20221030-4 OK
libfdisk1 2.39.3-2 OK
libffi6 3.2.1-2 OK
libfido2 1.15.0-1 OK
libgcc1 12.4.0-3 OK
libgdbm6 1.18.1-1 OK
libgmp10 6.3.0-1 OK
libgssapi_krb5_2 1.15.2-2 OK
libiconv2 1.17-1 OK
libintl8 0.22.5-1 OK
libk5crypto3 1.15.2-2 OK
libkrb5_3 1.15.2-2 OK
libkrb5support0 1.15.2-2 OK
liblz4_1 1.9.4-1 OK
liblzma5 5.6.3-1 OK
libmpfr6 4.2.1-1 OK
libncursesw10 6.5+20240427-1 OK
libp11-kit0 0.23.20-1 OK
libpcre1 8.45-1 OK
libpcre2_8_0 10.44-1 OK
libpipeline1 1.5.6-1 OK
libpopt-common 1.19-1 OK
libpopt0 1.19-1 OK
libreadline7 8.2-2 OK
libsmartcols1 2.39.3-2 OK
libssl1.1 1.1.1w-1 OK
libssl3 3.0.15-1 OK
libstdc++6 12.4.0-3 OK
libtasn1_6 4.14-1 OK
libuchardet0 0.0.8-1 OK
libuuid1 2.39.3-2 OK
libzstd1 1.5.6-1 OK
login 1.13-1 OK
man-db 2.13.0-1 OK
mintty 3.7.7-1 OK
ncurses 6.5+20240427-1 OK
openssh 9.9p1-1 OK
openssl 3.0.15-1 OK
p11-kit 0.23.20-1 OK
p11-kit-trust 0.23.20-1 OK
rebase 4.6.6-1 OK
run 1.3.4-2 OK
sed 4.9-1 OK
tar 1.35-2 OK
terminfo 6.5+20240427-1 OK
tzcode 2024b-1 OK
tzdata 2024b-1 OK
util-linux 2.39.3-2 OK
vim-minimal 9.0.2155-2 OK
which 2.20-2 OK
xz 5.6.3-1 OK
zlib0 1.3.1-1 OK
zstd 1.5.6-1 OK
Use -h to see help about each section
--
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FAQ: https://cygwin.com/faq/
Documentation: https://cygwin.com/docs.html
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