> The DIR command is the first command that needs to use the data channel,
> failure usually means the new data TCP connection has been blocked by a
> firewall or NAT routing has failed to find a route.

It might be possible, we have very restrictive firewall. Is there any
way how to detect which port it is trying to use so I can allow them?

> Some firewalls have trouble with secure FTP since they can not change the
> Passive Mode IP address reported in the control channel, a private
> 10.x.x.x range in your case.  Is the server on the same subnet?

No, ftp is on internet.

> Does FileZilla work from the same PC to the same FTP server using SSL?

FileZilla fails too:

Status: Connecting to ************:2990...
Status: Connection established, initializing TLS...
Status: Verifying certificate...
Status: TLS/SSL connection established, waiting for welcome message...
Response:       220 EFT Server 6.2.1 Build 03.04.2010.1
Command:        USER ***
Response:       331 Password required for ***
Command:        PASS ********
Response:       230 Login OK. Proceed.
Command:        PBSZ 0
Response:       200 PBSZ Command OK. Protection buffer size set to 0.
Command:        PROT P
Response:       200 PROT Command OK. Using Private data connection
Status: Connected
Status: Retrieving directory listing...
Command:        PWD
Response:       257 "/" is current folder.
Command:        TYPE I
Response:       200 Type set to I.
Command:        PASV
Response:       227 Entering Passive Mode (10,197,200,134,109,96).
Status: Server sent passive reply with unroutable address. Using
server address instead.
Command:        MLSD
Response:       150 Opening BINARY mode data connection for MLSD /.
Error:  Connection timed out
Error:  Failed to retrieve directory listing
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