Error in libcrypto connecting RHEL 9 server to Centos 6 via SFTP/SSH
https://serverfault.com/questions/1125843
create ~/.ssh/config
Host centos6
RSAMinSize 1024
KexAlgorithms +diffie-hellman-group14-sha1
MACs +hmac-sha1
HostKeyAlgorithms +ssh-rsa