Monitoring FTP server
port 21 / Telnet
FTP commands / Check FTP
Port
| 26-Mar-2025
In many environments it is important to monitor
FTP servers. Some options are described here.
Content
► FTP monitoring port 21 with Telnet or Putty
► FTP monitoring port 21 with PortCheck
► FTP monitoring port 21 with PingTool
You can check any FTP Server on FTP port 21 with the following Telnet commands. Open a command line and type:
This can also be achieved
If your server is online a connection will be established on
port 21 (FTP). A typical FTP Server answers with the an output like
this:
331 Password required for
pass TreeMonkeyHouse123
230 User
C:\Users\admin>portcheck -t ftp.domain.com 21 ftp.domain.com - Port 21 - OPEN - 30ms ftp.domain.com - Port 21 - OPEN - 34ms ftp.domain.com - Port 21 - OPEN - 40ms ftp.domain.com - Port 21 - OPEN - 47ms ftp.domain.com - Port 21 - OPEN - 30ms ftp.domain.com - Port 21 - closed ftp.domain.com - Port 21 - closed ftp.domain.com - Port 21 - closed ftp.domain.com - Port 21 - closed ftp.domain.com - Port 21 - OPEN - 30ms ftp.domain.com - Port 21 - OPEN - 29ms ftp.domain.com - Port 21 - OPEN - 41ms ftp.domain.com - Port 21 - OPEN - 33ms ftp.domain.com - Port 21 - OPEN - 38ms ftp.domain.com - Port 21 - OPEN - 32ms ftp.domain.com - Port 21 - OPEN - 34ms ftp.domain.com - Port 21 - OPEN - 30ms |
PortCheck offers many additional options like sending e-mails in the
case of a failure or notifying with a beep. PortCheck can check
multiple hosts on multiple TCP ports with a single command.
Open/Save configurations
Create custom actions
...
Common TCP ports: