How to Fix: SSH connection problem with "Host key verification failed..." error
Host key verification failed error occurs when the SSH server and client have different host keys. To resolve this issue, try the following:
📋 Table of Contents
The 'Host key verification failed' error occurs when the SSH client and server have different expectations about the host key. This issue is common in situations where a new server is added to the network or the existing server's host key has changed.
🛑 Root Causes of the Error
- The SSH client and server have different expectations about the host key.
- The existing server's host key has changed without being updated in the client.
- The new server's host key is not recognized by the client.
✅ Best Solutions to Fix It
Method 1: Update Host Keys
- Step 1: Run the command `ssh-keygen -f /etc/ssh/ssh_host_rsa_key` to generate a new host key.
- Step 2: Copy the new host key and paste it into the SSH client's 'Known hosts' file (usually located at `~/.ssh/known_hosts`).
Method 2: Use a Passphrase
- Step 1: Run the command `ssh-keygen -t rsa -b 2048` to generate a new host key with a passphrase.
- Step 2: Copy the new host key and paste it into the SSH client's 'Known hosts' file (usually located at `~/.ssh/known_hosts`).
✨ Wrapping Up
To resolve the 'Host key verification failed' error, update the host keys or use a passphrase to authenticate the connection. By following these methods, you should be able to establish a secure SSH connection between your servers.
❓ Frequently Asked Questions
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