rsync error: error in socket IO (code 10) at clientserver.c(125) [Receiver=3.1.2]

报错现象

[root@localhost ~]# rsync -avz backuper@20.0.0.51::wwwroot /opt
rsync: failed to connect to 20.0.0.51 (20.0.0.51): No route to host (113)
rsync error: error in socket IO (code 10) at clientserver.c(125) [Receiver=3.1.2]

解决方法

关闭防火墙

iptables -F
setenforce 0