Resolve ssh error from Mac OS to Cisco switch/router
Error message 1. ssh by option -o KexAlgorithms when you meet error message % ssh -oKexAlgorithms=+diffie-hellman-group1-sha1,diffie-hellman-group14-sha1 account@domain-name or 2. edit /etc/ssh/ssh_config unsharp middle two options and add two options at latest 3 reboot or configure encryption strength to 2048 bits when you generate keys references https://www.petenetlive.com/kb/article/0001245 https://www.volico.com/wiki/pages/viewpage.action?pageId=15728687