External port test

Test-NetConnection -ComputerName COMPUTER_NAME -Port PORT_NUMBER. Replace the COMPUTER_NAME portion with the actual remote PC name or IP address. Specify the port you need to connect to instead of the PORT_NUMBER portion. For example, let's test the connection to the DNS port (53) of the public Google DNS server (8.8.8.8).

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TCP Port Scanner. With this online TCP port scanner you can scan an IP address for open ports. Use this TCP port scan tool to check what services (apache, mail, ssh, ftp, mysql, telnet, dns) are running on your server, test if your firewall is working correctly, view open TCP ports.

Configuration using the external test set mode function (Mode 1) Setting the external test set mode. You can select the status of the external test set mode from 3 types: OFF, Mode 1, or Mode 2. When OFF is selected, the instrument operates as a network analyzer with a built-in 4-port S-parameter test set.

TCP Port Scanner, Online Port Scan, Port Scanning | IPVoid TCP Port Scanner. With this online TCP port scanner you can scan an IP address for open ports. Use this TCP port scan tool to check what services (apache, mail, ssh, ftp, mysql, telnet, dns) are running on your server, test if your firewall is working correctly, view open TCP ports. Using telnet to Test Open Ports | The Complete How-To