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23 wrz 2011 · If you wanted to telnet to your device on port 12345 you'd use: telnet 10.1.1.55 12345 You have to be able to establish a connection to the remote host and know which port number you want to talk to, though.
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.
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
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?
23 kwi 2015 · Ftp protocol use 2 ports 20 and 21, port 20 is for Control and port 21 for Data, and telnet only use port 23 to make interactions with a terminal.
7 sie 2021 · The first number of that group is the upper 8 bit of that port and the second number is the lower 4 bits, in our case 242*256 + 69 = 62021. To find the correct telnet command to use to establish a data channel, you can either do the calculation on your own or copy and paste what you’re getting onto this calculator:
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.
