scp免密码登录：Linux基础 - scp免密码登陆进行远程文件同步
执行scp一直是OK的，某天在本地生成了公钥私钥后，scp到某个IP报以下错误
The authenticity of host '192.168.233.137 (192.168.233.137)' can't be established. ECDSA key fingerprint is SHA256:EsqTfeCJ34DnGV66REuRRPhoFwaLuee5wxFgEAZ8b9k. Are you sure you want to continue connecting (yes/no)? Host key verification failed. lost connection
参考：好记心不如烂笔头，ssh登录 The authenticity of host 192.168.0.xxx can't be established. 的问题,即可不修改/etc/ssh/ssh_config文件的配置而解决此问题
ssh -o StrictHostKeyChecking=no 192.168.0.xxx
输入密码
再次scp，正常输入密码，问题解决。
ssh连接The authenticity of host can't be established
修改/etc/ssh/ssh_config文件的配置，以后则不会再出现此问题
最后面添加：
StrictHostKeyChecking no
UserKnownHostsFile /dev/null