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10 mar 2015 · you can check the connection via telnet. Go to the command prompt and type "telnet [ServerIp] portNo" telnet xx.xx.xx.xx 21
1 wrz 2015 · However, it also means that you need to open at least two ports on the server side: the FTP command port (21) and one or more FTP data ports (which can be anything above 1024) and then tell the server to use those ports for data.
26 kwi 2023 · In order to work correctly, FTP must use two ports — port 21 for command and control, and port 20 for data transport. An FTP client cannot perform the protocol if it fails to connect to the FTP ports. Unfortunately, some routers and firewalls block this port because hackers often target FTP servers via port 21.
TELNET: When I telnet to my ip address to port 21, it connects, but when doing it for port 25 and 110, it cannot connect, hence something is blocking it. Now, in IPTABLES, I enabled all the following ports to allow traffic: 80,21,25,110,143. See my iptables configuration below:
1 gru 2022 · If a server is accessible remotely with Telnet, you can also use it to check whether a port is open. To check if a port on your server is open, you need to use the following command. telnet <server IP address> <port>
27 gru 2023 · Telnet allows interactively connecting to ports to test open, closed, or filtered status; Look for quick connection success for open ports vs connection refused for closed ports; Use Telnet to connect to application ports like HTTP, SMTP, and FTP for protocol debugging ; But avoid using Telnet over the public Internet due to lack of security
16 sie 2021 · Learn how to use the Telnet command line tool to test if a port is blocked on your local network router or server. Or can you use Netcat or Nmap for better security?
