Introduction
In this article, we will discuss how to troubleshoot OpenSSH Git connections in Windows, especially when you have decided to reinstall Git and configure it to use Windows SSH. This guide will provide you with detailed context and cover key concepts, subtitles, and paragraphs, while using
tags for text and tags for code blocks.
Background and Reinstalling Git
Git is a popular distributed version control system that allows developers to track changes and collaborate on codebases. The Windows bundle of Git includes OpenSSH, which enables secure, encrypted communications between your local machine and remote repositories. If you have been using Git's bundled SSH for a long time and are now facing issues, you may want to consider reinstalling Git and configuring it to use the native Windows SSH.
Switching from OpenSSH to Windows SSH
Before starting the process, ensure that you have the OpenSSH client and the Windows 10 OpenSSH client (or newer) installed. You can download and install the latest version of Git for Windows, which includes both OpenSSH and Windows SSH:
https://github.com/git-for-windows/git/releases/download/v2.34.1.windows.1/Git-2.34.1.2-64-bit.exe
Once installed, run the following command in your Git Bash window to configure Git to use Windows SSH:
git config --global core.sshcommand '"C:\Windows\System32\OpenSSH\ssh.exe"'
Troubleshooting Non-Working Connections
Even after reinstalling Git and switching to Windows SSH, you might face non-working connections, primarily due to the following reasons:
- Incorrectly configured SSH settings
- Firewall blocking connections
- Missing or invalid SSH keys
- Known host validation issues
Incorrectly Configured SSH Settings
Ensure your Git config file has the correct SSH command set:
cat ~/.gitconfig
This file should contain:
[core]
sshcommand = "C:\\Windows\\System32\\OpenSSH\\ssh.exe"
Firewall Blocking Connections
Check your system's firewall settings and allow the necessary ports for Git and OpenSSH:
- TCP port 22 (for SSH)
- TCP port 9418 (for Git)
Missing or Invalid SSH Keys
If you are unable to connect to a remote repository, it might be due to the absence of required SSH keys:
- Generate your SSH key pair if you haven't already done so:
ssh-keygen -t rsa -b 4096 -C "[email protected]"
- Add the generated SSH key to the ssh-agent:
eval $(ssh-agent -s)
ssh-add ~/.ssh/id_rsa
- Copy the contents of the
.ssh/id\_rsa.pub file and add it to the remote repository's list of authorized keys.
Known Host Validation Issues
When connecting to a remote repository for the first time, your SSH client will ask you to confirm the server's fingerprint:
$ ssh -T [email protected]
The authenticity of host 'github.com (IP\_ADDRESS)' can't be established.
ECDSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no/[fingerprint])?
Confirm the server's fingerprint by typing "yes", and Git will store the known host in the .ssh/known\_hosts file. If this file is missing or corrupted, you may face connectivity issues. Remove any invalid entries or recreate the file to resolve the problem.
Summary and References
- Reinstall Git for Windows, configuring it to use the native Windows SSH client.
- Identify and resolve issues related to SSH settings, firewall rules, SSH keys, and known hosts.
References