Please debug SSH Proxy Command, it cannot connect remote server with multihop SSH on PuTTY

  • 9 months ago
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Sure, I'd be glad to help you debug your SSH Proxy Command configuration for multi-hop SSH connections using PuTTY.

In PuTTY, multi-hop SSH connections can be set up using Proxy Commands. Proxy Commands allow you to specify a command that acts as a proxy for establishing the connection to the target SSH server through intermediate hosts.

Here's how you can set up and debug your SSH Proxy Command in PuTTY:

  1. Open PuTTY:
    Start PuTTY and load the configuration for the remote host you want to connect to.

  2. Navigate to Proxy:
    In the PuTTY Configuration window, navigate to "Connection" > "Proxy."

  3. Configure Proxy Command:
    In the "Proxy type" section, select "Local" and enter the command that will act as your SSH Proxy Command. For example, if you are using the OpenSSH command-line tool to connect through intermediate hosts, the command might look like:

    perl
    plink.exe -agent -nc %host:%port %proxyhost %proxyport

    Make sure to replace the placeholders (%host, %port, %proxyhost, %proxyport) with the actual values.

  4. Debugging:

    • Test the Proxy Command separately in a Command Prompt to ensure it establishes the connection correctly.
    • Make sure that you have the necessary authentication methods configured for each hop, including key-based authentication.
    • If you're using key-based authentication, ensure that your private keys are correctly loaded in Pageant (PuTTY's authentication agent).
    • If there are any issues, check PuTTY's Event Log for error messages. Go to "Event Log" in the Configuration window and try to establish the connection. The Event Log will provide more detailed information about what's going wrong.

  5. Connect:
    Once you've configured and tested the Proxy Command, you can go back to the "Session" section, enter the target hostname and port, and click "Open" to establish the connection through the intermediate hosts.

Remember that setting up multi-hop SSH connections can sometimes be complex, especially if you're dealing with different authentication methods and configurations on each hop. Take your time to test and debug each step thoroughly.

If you encounter specific errors or issues, feel free to provide more details, and I'll do my best to assist you further.