SSH security improvements: Difference between revisions

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If you are using the command line <tt>ssh</tt> command on macOS, Linux, GitBash or Cygwin, you should tell your system to "forget" the old host key by running one of the following commands:
If you are using the command line <tt>ssh</tt> command on macOS, Linux, GitBash or Cygwin, you should tell your system to "forget" the old host key by running one of the following commands:


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  ssh-keygen -R graham.computecanada.ca
  ssh-keygen -R graham.computecanada.ca
  ssh-keygen -R cedar.computecanada.ca
  ssh-keygen -R cedar.computecanada.ca
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Afterwards, the next time you ssh to the cluster you'll be asked to confirm the new host keys, e.g.:
Afterwards, the next time you ssh to the cluster you'll be asked to confirm the new host keys, e.g.:


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  $ ssh graham.computecanada.ca
  $ ssh graham.computecanada.ca
  The authenticity of host 'graham.computecanada.ca (142.150.188.70)' can't be established.
  The authenticity of host 'graham.computecanada.ca (142.150.188.70)' can't be established.
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