While port 21 is generally accepted as EXPLICIT FTPS and 990 as IMPLICIT FTPS, in reality whichever port you will configure, except 990/989, will lead to EXPLICIT FTPS while ONLY 990/989 will be accepted as IMPLICIT FTPS. So, to answer your question: - depending on the FTPS Server configuration, you'll need to open port 21 or 990/989.

2011年4月13日 · 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 SSH it runs on whatever port the SSH daemon is listening on and that is administrator configurable.

When running nmap from my IP address, port 21 does not appear. Using software like FileZilla just returns "Connection timed out", as does ftp on a Linux box. Using Wireshark I can see "ICMP Destination unreachable (Port unreachable)" responses to the TCP SYN packets.

2012年5月4日 · Ensure that the windows firewall is allowing port 21 connections on that IP address. Check also that your ftp daemon is listening on 77.168.0.1. If you're trying to connect from a different computer to 77.168.0.1 then ensure that there is no firewall in the route.

2017年3月28日 · Can not open ftp port via firewalld Centos does not open port/s after the rule/s are appended Port 80 filtered nmap. I have the vsftpd service up and running: > netstat -plnt | grep ':21. ' tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 12393/vsftpd and I can log in using ftp localhost just fine. But when I attempt a remote login, I get "connection timed ...

2011年5月18日 · 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 channel connections. FTP servers handle many simultaneously connected clients on port 21. Web servers handle many simultaneously connected clients on port 80. Etc..

2017年4月13日 · In the active mode, an FTP server uses two ports, 21 for command signals, and 20 for data. In the passive mode in FTP, after the client connects to the server at port 21, the server the server gives the client a random ephemeral port to connect to, for the data connection, on which it starts listening.

This will start netcat listening on port 21 and will echo input to your shell. From another host, TELNET to port 21 of your server and verify that you get a TCP connection and that you see output in the shell when you type in the TELNET connection. Finally, bring VSFTPD back up, verify that it is listening on port 21, and try to connect again.

SFTP runs on top of SSH, which - by convention - uses the well known port of 22. The well known port, however, is only a convention - there is no way (and indeed no point) in preventing the server from listening on a different port. (i.e. you can run the server on port 63251 and it would still work, as long as the clients are connecting to that ...

2017年8月7日 · If you don't have such intermediate server (SSH, VPN etc.) you actually need to use another port. If the FTPS is configured to use the same port 21, see if you can use SFTP that defaults to port 22 (as it uses SSH).