Software⏱️ 3 min read📅 2026-06-11

How to Fix: Ssh load key error: invalid format

Windows 10 update causes SSH load key error due to invalid format.

Quick Answer: Try regenerating the SSH keys and updating the Cmder and Hyper configurations.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. ✅ Best Solutions to Fix It
  3. ✨ Wrapping Up

The 'SSH load key' error with an invalid format is a common issue that affects Windows users who have recently updated their operating system. This error occurs when the SSH client is unable to load the private key from the specified location, resulting in authentication failures.

This frustration can be particularly annoying for users who rely on SSH for remote access and collaboration. Fortunately, there are several methods to resolve this issue, and we will guide you through them step by step.

🔍 Why This Happens

  • The primary cause of the 'SSH load key' error is an incompatible format between the Windows SSH client and the private key file. This can occur when the operating system updates or when the private key file is not properly formatted.
  • Another possible reason for this error is a mismatch between the private key location and the expected format. In some cases, the Windows SSH client may not be able to read the private key from the specified location due to permissions issues or incorrect formatting.

✅ Best Solutions to Fix It

Regenerating Private Keys and Updating SSH Client

  1. Step 1: Open a command prompt as an administrator and navigate to the directory where your private key file is located. Type 'ssh-keygen -y -f C:\Users\user\.ssh\id_rsa' to regenerate the private key.
  2. Step 2: Copy the contents of the old private key file (if you still have it) and paste them into a new file with a .pub extension. This will create a new public key file that can be used for SSH authentication.
  3. Step 3: Update the SSH client on your system by running 'ssh -V' in the command prompt. This will display the version of the SSH client, which should match the version required by the private key file.

Using Git Bash to Authenticate

  1. Step 1: Open Git Bash and navigate to the directory where your private key file is located. Type 'ssh -i C:\Users\user\.ssh\id_rsa user@host' to authenticate using the private key.
  2. Step 2: Note that this method works because Git Bash uses a different SSH client that can read the private key file in the correct format.

✨ Wrapping Up

By following these steps, you should be able to resolve the 'SSH load key' error with an invalid format. Remember to regenerate your private keys and update your SSH client if necessary, or use Git Bash as a temporary workaround until the issue is resolved.

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