In T5376#177587, @sarthurdev wrote:

@svd135 can you try on latest rolling?

The data channels are not established.
As I understand it, the problem is that the required related ports are not forwarded dynamically to translated address

In T5376#176691, @Viacheslav wrote:

@svd135 Can you recheck?

table ip raw {

ct helper rpc_tcp {
        type "rpc" protocol tcp
        l3proto ip
}

Firewall can be turned off. It does not affect the result.

Now I'm using this build: VyOS 1.4-rolling-202301071830
It's working fine as with active as with passive FTP.

1.4-rolling-20220418
Issue is still not fixed

I've found out conf string with "--" works the same way like string without "--". Sorry to trouble you with this question.