start:mogon_cluster:access_from_outside_windows

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Download PuTTY (preferrably use the MSI installer package1)) and install it on your computer. The following steps will show you how to configure the PuTTY terminal.

Download putty and install

Before being able to transparently proxy your connection to mogon through the mogon-login host, you need to connect to the host manually once and accept the SSH host key. So first open Putty and enter mogon-login.zdv.uni-mainz.de in the Host Name field and use the Port 22022. When Putty prompts you for host key validation, accept it. Then close the window again.

Accepting the host key for mogon-login
  • Start a new Putty Session. On the left side, select the category “Connection”.
  • Click on “Data” and type in your username.
  • Now choose the category “Proxy” and set the Proxy type to local.
  • Change the Proxy Hostname and Port to mogon-login.zdv.uni-mainz.de and 22022.
  • Type in your MOGON username again and also enter your password2).
  • Enter plink.exe -nc %host:%port -l %user -pw %pass -P %proxyport %proxyhost as the local proxy command.
  • On the “Session” page, select the connection type SSH, enter <username>@mogon.zdv.uni-mainz.de in the Host Name field and use the Port 22.
  • Finally, choose a name for the Session (e.g. mogon.zdv.uni-mainz.de) and save the session profile for further use.

When you now click on “Open”, you connect directly to one of the MogonI login nodes. You might have to accept another host key for them, but that's fine.

Example configuration with the username schlarbm

Authentication on MogonII is done via a RSA key pair.

If you don't have a RSA key saved in a directory on your computer, doubleclick puttygen.exe, generate your key and save it into your favourite directory on your computer.

If you already have a RSA key saved in a directory on your computer proceed as follows:

First step is to deploy your RSA public key on the mogon-login-host. mogon-login-host is part of the demilitarized zone that allows access to MOGON I/MOGON II cluster from outside the university network.

  • Before being able to transparently proxy your connection to MogonII through the mogon-login host, you need to connect to the host manually once and accept the SSH host key.
  • Open Putty, enter mogon-login.zdv.uni-mainz.de in the Host Name field, use the Port 22022 and click Open. When Putty prompts you for host key validation, accept it.
  • Authenticate yourself with your <zdv_account> and your password.
  • Deploy your public key on mogon-login host in
    ~/.ssh/authorized_keys
Accepting the host key for mogon-login
Copy your public key from .ppk-file
paste with Shift+Insert

Second step is to deploy your RSA public key on the mogon-host. The mogon-host is a reference to the actual MogonI-login-nodes that allocate resources from the compute-nodes of MOGON I.

  • Deploy your public key on MOGON I. Because your home directory is the same on MOGON I and MOGON II clusters, it is sufficient to deploy your public key on either one of them. Because MOGON II only allows access with RSA authentication, you access MOGON I via password authentication, deploy your public key again in
    ~/.ssh/authorized_keys

    and close the connection again.

Third step is to open the ssh-connection to MOGON II with RSA authentication.

  • Start pageant.exe and load your RSA key.
Load RSA key in SSH authentication agent for PuTTY, PSCP, PSFTP, and Plink
  • Start putty.exe and load default settings.
  • Go to Connection→SSH→Auth and choose “Allow agent forwarding”
  • Go to Connection→Proxy and set the Proxy type to local. Change the Proxy Hostname and Port to mogon-login.zdv.uni-mainz.de and 22022. Type in your MOGON username. Enter plink.exe -A -agent -nc %host:%port -l %user -P %proxyport %proxyhost as the local proxy command
  • Go to Connection→Data and enter <your_username> again as “Auto-login username”
  • Go to Session, select the connection type SSH, enter <username>@miil01.zdv.uni-mainz.de in the Host Name field and use the Port 22.
  • Finally, choose a name for the Session (e.g. mogon2) and save the session profile for further use.

When you now click on “Open”, you connect directly to one of the MOGON II login nodes. You might have to accept another host key for them, but that's fine.

Example configuration

The only difference in the connection to MOGON I via RSA authentication is the hostname. Follow exactly the same steps as for MOGON II but instead of miil02, use mogon as hostname (the MOGON I Login-Node) in your configuration.

  • Replace the hostname <zdv_account>@miil02.zdv.uni-mainz.de with <zdv_account>@mogon.zdv.uni-mainz.de.

To enable X11 forwarding click on “X11” in the “SSH” subcategory, and click on the “Enable X11 forwarding” option. Make sure that the remote X11 authentication protocol is set to “MIT-Magic-Cookie-1”.

Be sure to add -X to the local Proxy command line.

X11 forwarding requires either X-Win32 or Xming to be installed on your computer.

The most recommended way to access the filesystem on Mogon is using FTPS, as described on that page.

If you must use WinSCP, configure it according to these screenshots (the Proxy configuration from PuTTY does not seem to work):

Example configuration with the username schlarbm

For this article we have used MobaXterm Home Edition v20.2 (Portable edition). Download MobaXterm first if you have not already done so.

Add your SSH-Key to MOGON

If you have not yet deployed your SSH-Key on MOGON, please follow these instructions to add your public key to MOGON.

Start the application abd click on the Session button to start a new session:

Choose SSH to create a new SSH session. The session you create is automatically saved:

Fill in the fileds Remote host and specify your Username. Afterwards go to Advanced SSH setting and provide the path to your SSH-Key which is already present on MOGON:

Now click on the Network settings tab and activate Conenct through SSH gateway (jump host):

Use 'sshgate.zdv.uni-mainz.de' as the gateway ssh server and enter your Username. Add the same private Key as before. The configuration is now complete and you can click on OK. A windows will open and you will be asked for the passphrase for your SSH key. After you entered the passphrase correctly, the session starts automatically.

Using MobaXterm SSH agent

Start MobaXterm and click on Settings:

now go to the SSH tab and deactivate Forward SSH agents. Add your SSH key by clicking the plus sign, you will be asked for your Passphrase. If your are finished click on OK:

You'll now be asked for the passphrase every time you start MobaXterm but can use your SSH keys in different sessions through the SSH agent without explicitly setting up the key.


1)
because in addition to the plain putty.exe you will most definitely need plink.exe for proxy connection, puttygen.exe for key generation and pageant.exe for key-based authentication
2)
You really need to store the password in this dialog. If you are security-aware and are hesitant to store your password, use the key-based authentication method.
  • start/mogon_cluster/access_from_outside_windows.1594757268.txt.gz
  • Last modified: 2020/07/14 22:07
  • by jrutte02