FTP SSL

Ruud Baart <[email protected]>
Newsgroups gmane.comp.security.shorewall
Message-ID <[email protected]>
Hi,

I can find quite a lot of documentation concerning a FTP server. But I 
don't find the way to do it.

My situation:

     Internet <--> Firewall <--> FTP server

Firewall and FTP server are Debian 11 and I use the latest shorewall.

The Firewall has three public IP addresses, FTP server had no public IP 
address. Firewall and FTP server are connected to a private 
172.23.10.0/24 network.

This setup is new but in fact a replica of the existing situation (I'm 
moving to a new hosting party). In the existing situation and new 
situation all works fine (Debian 10) as long as I don't use a 
certificate. This is the DNAT rule I use:

    SECTION NEW
    FTP(DNAT)   wan1  lan1:$FTP_INT -  -  - $FTP_EXT

where $FTP_INT and $FTP_EXT the internal and external IP addresses are 
of the FTPserver.

As said, works fine as long as I don't use a certificate. With TLS 
connection Filezilla:

     Status:    Server sent passive reply with unroutable address. Using 
server address instead.

I can login, problem must be related to data on port tcp/20. Can someone 
help me and tell me what I'm doing wrong or what I'm missing. Probably 
something with a helper.
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