Simply put, computer ports are the communication endpoints of a computer connected to a network. They are separated to differentiate the several processes and make it easier to handle them: so each one has a particular purpose and is associated to a specific protocol. Usually an outgoing server employs port 25: it’s the default SMTP port
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How to test COM port? Complete serial port testing guide
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). Test-NetConnection The Test-NetConnection cmdlet displays diagnostic information for a connection. It supports ping test, TCP test, route tracing, and route selection diagnostics. Depending on the input parameters, the output can include the DNS lookup results, a list of IP interfaces, IPsec rules, route/source address selection results, and/or confirmation of connection establishment. how to test outbound firewall rule Dec 29, 2010 How to test COM port? Complete serial port testing guide Dec 11, 2019