2个问题

1、调试交换机，连接console线，会出现隔一行的情况
2、ssh升级后。连接不上；（测试使用centos 7.9；默认OpenSSH_7.4p1，升级到openssh-9.5p1后。连接失败
![Uploading connect.png…]()

Reproduce the two reported cases: skipped lines when debugging a switch over a console cable, and the SSH connection failure on CentOS 7.9 after upgrading from OpenSSH_7.4p1 to openssh-9.5p1. Start with the serial-console and SSH connection entry points, collect the relevant logs and connection settings, and consider the issue resolved when both scenarios work or their causes are isolated.

Written by the indexing model from the issue text.