Warning: Remote host identification has changed #45

gtdang · 2023-04-13T17:14:38Z

gtdang
Apr 13, 2023
Maintainer

I cannot connect to Oscar. What is this error message about?

Warning: Remote host identification has changed
Offending RSA key in ~/.ssh/known_hosts:4. This indicates you have an offending RSA key at line no. 4

Answered by gtdang

This can occur when the login node hosts change. The solution is to remove the offending key to the former node.

Solution 1 - Removing the key from your known hosts manually.

$ vi ~/.ssh/known_hosts
# Remove the offending line (no: 4 in this example).
# Save and Exit, and Retry.

Solution 2 - Use ssh-keygen to remove all keys belonging to hostname from a known_hosts file.

ssh-keygen -R "ssh.ccv.brown.edu"

gtdang · 2023-04-13T17:33:29Z

This can occur when the login node hosts change. The solution is to remove the offending key to the former node.

Solution 1 - Removing the key from your known hosts manually.

$ vi ~/.ssh/known_hosts
# Remove the offending line (no: 4 in this example).
# Save and Exit, and Retry.

Solution 2 - Use ssh-keygen to remove all keys belonging to hostname from a known_hosts file.

ssh-keygen -R "ssh.ccv.brown.edu"

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