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For my own purposes[1], I wrote these wrappers that abstract the differences between the two versions of nc that I had to deal with away:

https://github.com/pflanze/chj-bin/blob/master/netcat-get https://github.com/pflanze/chj-bin/blob/master/netcat-push https://github.com/pflanze/chj-bin/blob/master/netcat-receiv... https://github.com/pflanze/chj-bin/blob/master/netcat-serve-...

(They use 'have' from here: https://github.com/pflanze/chj-bin/blob/master/have )

[1] for example my way to transfer files between servers: https://github.com/pflanze/chj-bin/blob/master/netoffer (which depends on netfetch from the same place)

If I remember correctly one of them requires you to specify the port with -p separately, and the other gets it from -l. So it's nc -l 1234 on one, and nc -l -p 1234 on the other.

I just confirmed this is not the case. Could you share what you were doing?

Seems like bartbes pointed out the problem. I suppose not specifying the port correctly makes it use some default port or something like that.