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Press Start and then press “Windows PowerShell”.

Check if the OpenSSH client is installed by typing the following command into PowerShell.

PS C:\> gcm ssh | fl

Name            : ssh.exe
CommandType     : Application
Definition      : C:\WINDOWS\System32\OpenSSH\ssh.exe
Extension       : .exe
Path            : C:\WINDOWS\System32\OpenSSH\ssh.exe
FileVersionInfo : File:             C:\WINDOWS\System32\OpenSSH\ssh.exe
                  InternalName:
                  OriginalFilename:
                  FileVersion:      7.7.2.1
...

If the details of ssh.exe are displayed as above, it has been installed.
If you do not see it, Windows Update (version 1803 or later) with administrator privileges will install the OpenSSH client by default. If not, open Settings, select Apps > Apps & Features, then select "Optional Features" .

Generate an ssh key in PowerShell. (After # are comments)

PS C:\> ssh-keygen -t ecdsa -b 384
Generating public/private ecdsa key pair.
Enter file in which to save the key (C:\Users\username\.ssh\id_ecdsa):  # enter
Enter passphrase (empty for no passphrase):  #Enter passphrase
Enter same passphrase again:  #Enter passphrase
Your identification has been saved in test.
Your public key has been saved in test.pub.
The key fingerprint is:
SHA256:UQwYcMTRGPdEDwQ7y4z5OS+j9PhFpavrKZ3W7jEuH1E username@localhost
The key's randomart image is:
+---[ECDSA 384]---+
|    .+*B+**      |
|     .+..=.o     |
|        + . E    |
|       = + +     |
|      o S +      |
|       . o o     |
|      ..+o*      |
|     ..oBB.+     |
|      o*BO*      |
+----[SHA256]-----+

Key pairs are created in the (C:\Users\username\.ssh\id_ecdsa) by default. The key may not be used unless it is placed in a folder under the user.

Please apply for registration of the created public key id_ecdsa.pub.
　isee Jump Server account request 　CIDAS System account request

Use ssh-agent to avoid entering the passphrase for ssh connections and to avoid putting the private key on the steppingstone server.
Select Start > Administrative Tools > Services. Open the properties of the "OpenSSH Authentication Agent". Select automatic as the startup type, press start, and start the ssh-agent service (properties).
Next, register the private key id_ecdsa.

PS C:\> ssh-add 'C:\Users\username\.ssh\id_ecdsa'
Enter passphrase for C:\Users\username\.ssh\id_ecdsa:　#Enter passphrase
Identity added: C:\Users\username\.ssh\id_ecdsa (C:\Users\username\.ssh\id_ecdsa)

The registered key can be checked with “ssh-add -l”. If you want to delete a registered key, use “ssh-add -D” to do so.

Enter the following:

PS C:\> ssh Jump Server Username@Jump Server -A
The authenticity of host 'Jump Server (***.***.***.***)' can't be established.
ECDSA key fingerprint is SHA256:UQwYcMTRGPdEDwQ7y4z5OS+j9PhFpavrKZ3W7jEuH1E.
Are you sure you want to continue connecting (yes/no)?  # yes
Warning: Permanently added Jump Server,***.***.***.***' (ECDSA) to the list of known hosts.

option -A: Enables forwarding of connections from an authentication agent such as ssh-agent.
After connecting to the Jump Server, you can use the same private key that you used at the first connection to connect to another server.

X11 Forwarding is what gives you the ability to use X application window on your local host when connecting remotely.
First, download and install VcXsrv Windows X Server.
VcXsrv download

In the startup screen, proceed with the default settings, and in the final "finish configuration" screen , press “save configuration” to save the settings in an appropriate location. The default name of the configuration file is “config.xlaunch”.

By double-clicking the configuration file, VcXsrv Windows X Server will start. To make it start automatically, register it to the startup.
Open Start > Windows system tools > Open Run Command , press “shell:startup”. Move the configuration file config.xlaunch saved earlier to the startup folder.

次に, 環境変数DISPLAYを設定する. VcXsrv Windows X Server が起動しているとインジケーターにアイコンが表示されるが, アイコンの上にマウスを乗せると “localhost:0.0 -1 clients” のように表示されるので, この localhost:0.0 を環境変数DISPLAYに設定する. ここでの locaohost 部分は, ローカルのホストネーム, 127.0.0.1, localhost のいずれでもよい.

PS C:\ [System.Environment]::SetEnvironmentVariable("DISPLAY", "localhost:0.0", "User")

PS を再起動し, 設定されているか確認する.

PS C:\ $env:DISPLAY
localhost:0.0

x転送を許可するオプションを追加し, ssh接続する. xアプリケーションを起動し, 転送できているかを確認する.

PS C:\ ssh -AXY 踏み台username@踏み台サーバ

以上の設定をファイルに保存し (C:\Users\username\.ssh\config), sshコマンドを省略できる.
* IdentityFile は秘密鍵を ssh-agent に登録するため必要ないが, 記録のため記述しておくとよい.

Host 踏み台
  ForwardAgent yes
  ForwardX11 yes
  ForwardX11Trusted yes
  User 踏み台username
  HostName 踏み台サーバ
  IdentityFile "C:\Users\username\.ssh\id_ecdsa"

下記コマンドでssh接続できる.

PS C:\ ssh 踏み台