Sounds like you didn't actually run a server at localhost:6666? A simple echo server would do. (You can find one at localhost:echo sometimes, though it's trivial to write one.)

Why would I need an external server to communicate between two threads using sockets?

Does not compute

In reply to Re^4: Can I/O operations on the same IO::Socket be executed in different threads? by Anonymous Monk
in thread Can I/O operations on the same IO::Socket be executed in different threads? by Anonymous Monk

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