[Proftpd-user] ProFTPD server sending PORT for passive on different IP address than contacted

So we have a server with multiple IP addresses, but the same structure
when accessed, so there's been no reason to use VirtualHost
definitions for the different IP addresses. Our setup looks like this:

DefaultAddress 198.x.y.100 198.x.y.103 2001:4d0:x:y::64 2001:4d0:x:y::67
...
PassivePorts 64000 65000


When a client contacts the server via the 198.x.y.103 address,
provides user name and password, then changes directory, the server
sets a passive port but uses the IP address of 198.x.y.100. The client
then can't connect because their firewall doesn't see it as a related
connection because they're using FTPS and thus the firewall can't do
SPI of the contents of the port negotiation.

How can I force Proftpd to only respond and provide ports for the IP
address on which it was contacted and not just the first one in its
DefaultAddress setting?


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