How To Test If Firewall Port Is Open?
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1. Use the Telnet Command: To test if a port on a remote host is open, you can use telnet to try to connect to the port. If the connection is successful, the port is open.
2. Use the Nmap Command: Nmap (Network Mapper) is a popular open-source network scanning tool that can be used to detect open ports on a remote machine.
3. Use the Curl Command: The curl command can be used to test if a port is open on a remote machine.
4. Use a Port Scanner Utility: There are many third-party port scanner utilities available that can be used to scan for open ports on a remote machine.