• Version: v13.1.0
• Platform: GNU/Linux
• Subsystem: internal/validators.js, internal/errors.js, and subsequently dgram.js

What steps will reproduce the bug?

1. Socket.send and Socket.connect from dgram.js use a function called validatePort, pulled from internal/validators.js

2. validatePort takes in an optional options argument, w/ a variable allowZero, which defaults to true.

3. ERR_SOCKET_BAD_PORT (internal/errors.js) returns an error w/ string '%s should be >= 0 and < 65536. Received %s.' and a RangeError

4. dgram.js calls validatePort with allowZero set to false, which produces the illogical error:

   • RangeError [ERR_SOCKET_BAD_PORT]: Port should be >= 0 and < 65536. Received 0.

(The illogical part is that the >= does not change to > when allowZero is set to true.)

How often does it reproduce? Is there a required condition?

Always. Call validatePort with port value of 0, with allowZero set to false.

const { validatePort } = require('internal/validators');
let port = 0;
port = validatePort(port, 'Port', { allowZero: false });

What is the expected behavior?

The error message should have the capability to change the hard-coded >= sign to a >

What do you see instead?

RangeError [ERR_SOCKET_BAD_PORT]: Port should be >= 0 and < 65536. Received 0.

Additional information