Is there a firewall in between your system & the server?

Then the problem probably is that FTP uses two channels for data transfer,
one is control (command + status resp) and the other is
the data itself.

The control channel has no data for 40 minutes, and a firewall in between
may assume the stream died and succesivly drops the connection.
Any remaing answers by the server are then lost.
curl will wait for the answer that will not come.

Solution is to extend the lifetime of unclosed links through that firewall.

Nico Baggus
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