Re: [hylafax-users] Hylafax clients and server - tcp ports

[Oliver Margraf <r908tlv@xxxxxx>]

Hello Aidan,

Aidan Van Dyk schrieb:
> HylaFAX uses a FTP style protocol.  That means it has the control
> connection and DATA connection.

Ok, I see - makes some sense now.

> If you're using ACTIVE transfers, then hfaxd connects back to the
> specified port on the *client* machine for the DATA connection.  If
> you're using PASSIVE,  hfaxd listens on a port (the OS gives it that
> port) that the client to connects to for the DATA connection.  The ports
> used for these PASSIVE connections is determined by the OS running
> hfaxd.  The ports to use are passed as commands in the control
> connection.  All standard FTP stuff.
> So, if you're firewall understands state, and FTP, just make it do "FTP"
> on port 4559 as well as 21, and you're all set.  Then it will allow the
> "related" connections needed for the DATA connections.

OK, thanks - will give it a try tomorrow. :)

Oliver


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