Failed to retrieve directory listing from encrypted FTP server

ClintonK
ClintonK used Ask the Experts™
on
I've changed the configuration of FTP on my Synology NAS from unencrypted to encrypted.
When I now attempt to connect using Filezilla the directory listing never appears:
Status:	Connecting to XXX.XXX.XXX.XXX:21...
Status:	Connection established, waiting for welcome message...
Status:	Initializing TLS...
Status:	Verifying certificate...
Status:	TLS connection established.
Status:	Logged in
Status:	Retrieving directory listing of "/My_Remote_Directory"...
Command:	CWD /My_Remote_Directory
Response:	250 CWD command successful.
Command:	TYPE I
Response:	200 Type set to I.
Command:	PASV
Response:	227 Entering Passive Mode (XXX,XXX,XXX,XXX,XXX,242)
Command:	MLSD
Error:	Connection timed out after 20 seconds of inactivity
Error:	Failed to retrieve directory listing

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I've set Filezilla to use Passive transfer mode

My NAS settings are NAS Settings
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Expert Office
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Software Engineer
Distinguished Expert 2018
Commented:
FTP requires 2 connections: 1 command stream and 1 data stream.
To allow the datastream along a firewall the command stream needs to be unencrypted... ergo FTP across firewalls is a pain.
Either insecure because passwords are not encrypted or secure and impossible to get data accross.
So your best bet would be to use SCP/SFTP based on SSH tunnels.  or have Site-Site connection using IPSEC and have a flat network that is secure as well.

SSH tooling for windows can use WinSCP (and Putty for shell access). For Unix/Linux just ssh has all the components to be used.

Author

Commented:
The VPN option sounds like a runner.
Both locations have a fixed IP address  so I guess that helps. I have two Draytek routers; one in the Office and one at Home.
Do I just configure the Home router as a VPN Server and the Office as a VPN Client and then use unencrypted FTP at the Office  with the LAN address of the NAS server at Home?
All other traffic from the Office that doesn't use a Home LAN IP address will just go off out to the Internet as it does now?
nociSoftware Engineer
Distinguished Expert 2018

Commented:
You choose one to be VPN server, the other VPN client.
Use AES & SHA 256 if possible. 3DES/MD5 is more or less obsolete now.
With draytec it is a fairly straight forward  fill out  forms exercise.
Yes only a route to the remote address range for the tunnel will be created.

Author

Commented:
Managed to configure Draytek VPN server on 2860.
Rather messed up configuring VPN Client on 2960 -  managed to knock out the local LAN. Currently arranging another out of hours session to have another attempt.
Will report back.

Author

Commented:
I've configured a site to site tunnel and reverted back to ordinary FTP.
Thanks

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