Why doesn’t zeromq work on localhost?

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As @fdb points out:

The problem is at line:

subscriber.bind("tcp://localhost:5555")

try to change to:

subscriber.bind("tcp://127.0.0.1:5555")

However this deserves more explanation to understand why.

The documentation for zmq_bind explains (bold emphasis mine):

The endpoint argument is a string consisting of two parts as follows:
transport://address. The transport part specifies the underlying
transport protocol to use. The meaning of the address part is specific
to the underlying transport protocol selected.

Since your example uses tcp as the transport protocol we look in the zmq_tcp documentation to discover (again, bold emphasis mine):

When assigning a local address to a socket using zmq_bind() with the
tcp transport, the endpoint shall be interpreted as an interface
followed by a colon and the TCP port number to use.

An interface may be specified by either of the following:

  • The wild-card *, meaning all available interfaces.
  • The primary IPv4 address assigned to the interface, in its numeric representation.
  • The interface name as defined by the operating system.

So, if you’re not using wild-card or the interface name, then it means you must use an IPv4 address in numeric form (not a DNS name).

Note, this only applies to the use of zmq_bind! On the other hand it is perfectly fine to use a DNS name with zmq_connect as discussed later in the docs for zmq_tcp:

When connecting a socket to a peer address using zmq_connect() with
the tcp transport, the endpoint shall be interpreted as a peer address
followed by a colon and the TCP port number to use.

A peer address may be specified by either of the following:

  • The DNS name of the peer.
  • The IPv4 address of the peer, in its numeric representation.

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