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The last of these error messages can point to a man-in-the-middle attack, or to an upgrade of security of the cluster you are trying to connect to (in the latter case, you should have been informed already). One such upgrade occurred on the Niagara cluster on May 31, 2019. See [https://docs.scinet.utoronto.ca/index.php/SSH_Changes_in_May_2019 this page] for the one-time action required from users after the security upgrade. | The last of these error messages can point to a man-in-the-middle attack, or to an upgrade of security of the cluster you are trying to connect to (in the latter case, you should have been informed already). One such upgrade occurred on the Niagara cluster on May 31, 2019. See [https://docs.scinet.utoronto.ca/index.php/SSH_Changes_in_May_2019 this page] for the one-time action required from users after the security upgrade. | ||
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If you see any of the other error messages, you will have to upgrade your OS and/or SSH client that supports strong ciphers, key exchange protocols and MAC (message authentication code) algorithms. | If you see any of the other error messages, you will have to upgrade your OS and/or SSH client that supports strong ciphers, key exchange protocols and MAC (message authentication code) algorithms. | ||