FTP question

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FTP question

L0 Member


I am trialing a WING FTP server here at the office.  FTP and HTTPS work fine to the server from a FileZilla client.  I have an SSL certificate loaded onto the server for FTPS/HTTPS.  When I try to connect to the server via FTPS (port 990), the client connects but gets stuch at listing the directory contents.  The FileZilla client hangs at the command : MLSD.  Eventually, it times out.

I confirmed that FTPS works on my LAN so I am focusing on the firewall.  I do not see any Threat attempts that may have been dropped except for a few previous attempts at an SSH  (SFTP) connection I tried.

Any thoughts?

P.S.> an SSH connection works to this server from the outside,as well.  So it looks like the only issue is with FTP over SSL.

Thanks, Mike


L4 Transporter


May I know how you apply your policy for SSH traffic to your server? Have you tried to allow SSH traffic to and from your SFTP server?



I have a new rule for this testing configured as follows:

Source Zone: Untrust
Source Address: Any
Source User: Any

Destination Zone: Trust
Destination Address: My FTP's Nat Address

Application: Any
-Custom FTP(port 31)
-Custom FTPS(port 990)
-Custom SFTP(port 32)

Profiles: Only blocking for Virus' and Spyware.  Everything else open.
Sessions sent at END only.

I have a production Microsoft FTP server on the same server as the WING.  The MS FTP is only listening on port 21, hence the custom ports of 31/32.  The MS FTP works fine from both outside and inside the LAN.

There is a test Outbound rule for this server but I have never seen it used yet.

[See attached screenshot.]


are you seeing any drops in the traffic logs?

if not and since you are not seeing the traffic match your security rule I am going to assume that the implicit deny rule is dropping your traffic. This would mean that some of the parameters of the traffic do not conform with the security policy. I suggest performing a packet capture from the ftp client and server to determine where your security policy is not matching the actual traffic.


It actually ended up being a problem with the configuration of their server.  It works fine now.  Thanks for checking in.


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