Agent and server connection problem

Get value from agent falied:cannot connect to [IP:PROT] Noroute to host

1 If you see this error, you can first determine that it is a connection problem between the agent and the server.
2 First, use the server to ping the agent. If it can ping, proceed. It may be a firewall problem.
3 Add a policy firewall-cmd --zone=public --add- port=10050/tcp --permanent
4 firewall-cmd--reload
5 or turn off the firewall directly