passive mode FTPS would use a control port over port# 1024 and so it would work better with a firewall than non-passive. the client tells port 21 what upper-bound port to open and so you can configure the …

FTPS by default runs on port 990, but that's not related to SFTP: in fact it is FTP over SSL These are two distinct and completely different protocols. SFTP (SSH File Transfer Protocol) only needs port 22 …

Oct 13, 2009 · While TCP port 22 is the general right answer, this is dependent on the fact that SSH is configured to use the standard port and not an alternative port. As SFTP runs as a subsystem of …

Jul 23, 2011 · The command netstat -tanp will show you what PID is associated with what port, look for a line like this to find what daemon is LISTENing on port 21: tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN …

However, if the FTP control connection is encrypted using TLS/SSL, the firewall cannot determine the TCP port number of a data connection negotiated between the client and FTP server.

May 18, 2011 · 40 I'm struggling to come to grasp with why all FTP servers requires the use of a port range for passive mode data channels as opposed to only using one data port for all incoming data …

Dec 21, 2010 · The FTP server always receives traffic on port 21. It sends out traffic with a source port of 20 while using active ftp and with a a random port greater than or equal to 1024 while using …

When setting up an FTP in IIS the default port will be 21. I had to open port 21 in the firewall which got me a stage further but it'd hang at Opening ASCII mode data connection.

To do passive-mode FTP, you need to allow incoming connections to TCP port 21 and incoming connections to a randomly-generated port on the server computer (necessitating using a conntrack …

EDIT: Quoted from this wonderful source: In passive mode FTP the client initiates both connections to the server, solving the problem of firewalls filtering the incoming data port connection to the client …