요약 ubuntu 22.04.1 을 설치하고 oracle linux 7.9에서 접근하려고 했는데 인증 오류("no matching MAC found" )가 났고 [-m mac_spec] 설정으로 해결했어요 $ ssh -m hmac-sha2-512 -A spc@10.***.70.41 문제 there's some incompatibility between the ssh client shipped with Windows and the server on Ubuntu 22.04. #사례1 # source, linux Oracle Linux Server release 7.6 # source, ssh OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017 $ telnet 10.***.70..