What does Connection attempt from disallowed node mean?

Question

What happen when you see the following error message in the Erlang VM?

** Connection attempt from disallowed node [email protected] **

Is it about when we do not set cookies for two nodes or when we set different cookies for two nodes?

Answer 1

This is because both nodes don't have the same cookie. Start both nodes with the same cookie and check that the cookie on both nodes are identical using

erlang:get_cookie().