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I am getting this error when trying to connecting
we have opened passive ports on IIS on the servers from 1051-1150.

Status: Resolving address of **URL removed***
Status: Connecting to xxx.xxx.xxx.xxx:21
Status: Connection established, waiting for welcome message...
Status: Insecure server, it does not support FTP over TLS.
Status: Logged in
Status: Retrieving directory listing...
Command: PWD
Response: 257 "/" is current directory.
Command: TYPE I
Response: 200 Type set to I.
Command: PASV
Response: 227 Entering Passive Mode (20,36,252,6,197,142).
Command: LIST
Response: 150 Opening BINARY mode data connection.
Error: Connection timed out after 20 seconds of inactivity
Error: Failed to retrieve directory listing
Status: Disconnected from server
Status: Resolving address **URL removed***
Status: Connecting to xxx.xxx.xxx.xxx:21
Status: Connection established, waiting for welcome message...
Status: Insecure server, it does not support FTP over TLS.
Status: Logged in
Status: Retrieving directory listing...
Status: Directory listing of "/" successful
Status: Disconnected from server: ECONNABORTED - Connection aborted

The server (or a malicious firewall or router sabotaging the traffic) advertises passive port 197 * 256 + 142 = 50574