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Why should telnet to UDP port fail?

Updated: 9/17/2019
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13y ago

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A single port can be configured to listen for UDP or TCP inbound connection requests (or both). Telnet uses TCP. So when you telnet to a specific IP:port, telnet will attempt to make a TCP connection. If there is no TCP listener on the port you specify, then the connection request will be refused. It matters not if you have a UDP listener on the port. Telnet will not be able to establish a connection to a UDP port.

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15y ago
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Q: Why should telnet to UDP port fail?
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