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/etc/ssh/ssh_config line 60: Bad SSH2 cipher spec '-arcfour,arcfour128,arcfour256'.Getting this error what may be the reason-prefix is not supported anymore and that's the reason of the error @AbhinavKinagi is getting. In fact, check:bash man sshd_configand you'll see: Specifies the ciphers allowed. Multiple ciphers must be comma-separated. If the specified value begins with a ‘+’ character, then the specified ciphers will be appended to the default set instead of replacing them.