1、参考链接：Linux服务器升级openssh9.9最新版全过程，及遇到问题处理_openssh升级-CSDN博客
2、升级提前备份/etc/ssh/sshd_config、/etc/pam.d/sshd
3、升级问题
Linux 无法远程登录，错误日志：PAM unable to dlopen(/usr/lib64/security/pam_stack.so): /usr/lib64/security/pam_stack.so: cannot open shared object file: No such file or directory – 零五网
