filezilla failed to retrieve directory listing fixed

FILEZILLA FAILED TO RETRIEVE DIRECTORY LISTING FIXED PASSWORD
FILEZILLA FAILED TO RETRIEVE DIRECTORY LISTING FIXED WINDOWS

A dynamic port forwarding rule is made for that client forwarding the port defined by p1,p2 from the NAT device to the FTP server.In the response PORT h1,h2,h3,h4,p1,p2 the ip-address h1,h2,h3,h4 of the FTP server will be replaced with e1,e2,e3,e4 representing the (external) ip-address e1.e2.e3.e4 of the NAT server that the client is connected to.Upon seeing a PORT response it will typically make two changes: In addition it will run a similar NAT FTP helper module that in the clear text FTP protocol, can scan for and detect the PORT response. When the FTP server is behind a device that does network address translation and port forwarding traffic on the control connection on port 21 will be forwarded from the (external) ip-address of the NAT device to port 21 on the FTP server. in your firewall open both port 21 and that fixed range of ports for data connections.

fix the range of ports the FTP server will use for passive connections to a small range.

When the connection is encrypted with TLS the firewall can't detect the PORT response anymore and therefor not automatically open the assigned port. An FTP helper module will then automatically open up the port number that gets assigned by the FTP server to that specific client, allowing for quite granular access control. Normally in an intelligent firewall when you allow FTP you need to open the port for the control connection, TCP 21 and then, in the clear text FTP protocol, the firewall can scan for and detect the PORT response. That results in problems with servers that are protected by firewalls and which are behind NAT devices. In FTP over TLS the connection between client and FTP server is encrypted. Where h1.h2.h3.h4 is the FTP server's IPv4 IP-address and the TCP port number is (p1*256) + p2 i.e. The PORT response typically contains 6 octets, eg PORT h1,h2,h3,h4,p1,p2 To actually transfer data (and getting a directory listing is a data transfer) the client needs to make a second TCP connection, the data connection.Īfter an FTP client requests a passive ftp connection with the PASV control word the FTP server selects a 'random available ephemeral', non-default port and announces that port with the PORT response. In passive FTP that is initially one control connection to a default port, TCP 21 The problem with FTP over TLS with both firewalls and NAT appliances is two-fold, with both firewall and NAT problems.įTP is a crappy protocol that requires two connections: I'd appreciate any help in getting past this. Reply: 227 Entering Passive Mode (xxx,x,xxx,xxx,196,107) Status: Resolving address of xxx.x.xxx.xxx Reply: 425 Can't open data connection for transfer of '/'Īllow fallback to plain FTP Warning: Allowing fallback to plaintext FTP is insecure. Reply: 227 Entering Passive Mode (xxx,x,xxx,xxx,196,44)

FILEZILLA FAILED TO RETRIEVE DIRECTORY LISTING FIXED PASSWORD

Reply: 331 Password required for username Status: cert: subject='CN=xxx.x.xxx.xxx,C=US,ST=My state,L=My city' issuer='CN=xxx.x.xxx.xxx,C=US,ST=My state,L=My city' Status: Received 1 certificates from server. Status: TLS handshake successful, verifying certificate. Status: Connected, waiting for welcome message.Ĭommand: CLNT on behalf of xxx.x.xxx.xxx Warning: The entered address does not resolve to an IPv6 address. I tested with and this is the logĮxplicit FTP over TLS Status: Resolving address of xxx.x.xxx.xxx The only way I've had any success is when the client is on the same side of the NAT and only when straight up plain FTP and only in active mode. My server is behind a NAT and has a static IP which is also listed on the passive settings tab of Firezilla Server. My router also has this range of ports forwarded on TCP to the correct LAN IP.

FILEZILLA FAILED TO RETRIEVE DIRECTORY LISTING FIXED WINDOWS

I've set up Firezilla and the Windows Firewall to let in the same range of ports. My goal is to get Explicit FTP over TLS working with Firezilla server. Not sure what disabling this 'feature' means for security. Summary of what resolved it: After fixing a mis-typed port on the router, I got the error '450 TLS session of data connection has not resumed or the session does not match the control connection' - which led me to unticking the server setting 'Require TLS session resumption on data connection when using PROT P' which fixed the problem.

Filezilla failed to retrieve directory listing fixed