https://github.com/input-output-hk/cardano-tutorials/blob/master/Shelley-testnet/Exercise-3.md

[willcbanks]

On this page it says:

For the relay, you will want to add:

...
"Producers": [
  {
    "addr": "127.0.0.1",
    "port": 4240,
    "valency": 1
  },
  {
    "addr": "relays-new.ff.dev.cardano.org",
    "port": 3001,
    "valency": 1
  }
]

I think is meant to say:

"port": 4242,

[CarlosLopezDeLara]

Example is correct:

Core node running on port 4240 and connecting with its relay on port 4242; and relay running on port 4242 and connecting with its core node on port 4240