add tip/tricks for window

Author: xtutran

window/README.md

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+## Some tip/tricks for Window

window/ssh/README.md

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+1. Downloading Cygwin
+   - download cygwin setup.exe and run it
+   - choose an appropriate mirror
+		Note: I will assume that Cygwin will be installed into C:\Programs\Cygwin. Do not install Cygwin into a folder that contains a space character (C:\Program Files). If you do so, you will face many random and unexpected troubles.
+2. Install from packages, choose the following:
+   - OpenSSH,
+   - tcp_wrappers,
+   - diffutils [this should be pre-selected],
+   - zlib
+   
+   proceed with installation until it is finished.
+
+3. Configuring Cygwin
+
+   - run CygWin Bash Shell with Administrator privileges (C:\cygwin\Cygwin.bat)
+   - from this Bash shell run ssh-host-config
+   - say “yes” to privilege separation
+   - say “yes” to create the sshd account
+   - say “yes” to install sshd as a service
+   - press to enter an empty value of CYGWIN for the daemon
+   - Now Cygwin needs to create a new account that will be used as a “proxy”/setuid origin account. Say “no” to use the default name (cyg_server).
+   - say “yes” to create a new privileged account cyg_server.
+   - create a password for this new privileged account and confirm it
+   - synchronize Windows user accounts with Cygwin user accounts:
+		mkpasswd -cl > /etc/passwd
+		mkgroup --local > /etc/group
+   - start SSH server with net start sshd
+
+   - test connection with 'ssh localhost' from Cygwin Bash Shell.
+		say “yes” to check and store server fingerprint
+		put your Windows account password to authenticate
+		issue a few test commands in the remote session
+		close session with exit.
+		alternatively: test your SSHD with putty.
+		
+4. Common issues
+   - Connection closed by ::1 error
+   => How to fix?
+		+ Check your hosts file: C:\Windows\System32\drivers\etc\hosts
+		+ Uncomment two lines:
+			127.0.0.1       localhost
+			::1             localhost
+		+ Uninstall current sshd
+			# Remove sshd service
+			cygrunsrv --stop sshd
+			cygrunsrv --remove sshd
+			# Delete any sshd or related users (such as cyg_server) from /etc/passwd
+			#   (use your favorite editor)
+			# Delete any sshd or relaged users (such as cyg_server) from the system
+			net user sshd /delete
+			net user cyg_server /delete
+		+ Re-install sshd (as step 3.)
+