MaxStartups 参数导致paramiko SSHException: Error reading SSH protocol banner
/etc/ssh/sshd_config
MaxStartups 10:30:100
默认值是10:30:100,表示如果超过 10 个并发初始化连接,则后续的连接由 30% 的几率直接被关闭,如果超过 100 个连接,则所有新的连接 100% 直接关闭
SSHException: Key-exchange timed out waiting for key negotiation
paramiko.ssh_exception.SSHException: Error reading SSH protocol banner
No existing session