VMware: Verify TCP port availability on a remote host from a VMware vCenter Server Appliance (VCSA) command prompt

To check the availability of the remote TCP port from the VCSA console, log in there with the user "root" and follow these steps:
1. Go to bash with the command "shell".
2. Use curl to check the availability:

curl -v telnet://IP_ADDRESS_or_DNS_NAME:PORT

Example: curl -v telnet://smtp.server.local:25