Netizen @ Bo has a Vultr host that uses the CentOS system. The default port 22 has been modified for security reasons. As a result, WinSCP and Xshell cannot log in to the server after the new port is successfully modified. After receiving a request for help, Weiaisi Blog considered only two cases: one is that the network has timed out, and the other is that the new port is protected by the server
