UDP Port 21 Information
Port name:FTP-CONTROL
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Port 21 common errors:Port 21 is classified as a network port that utilizes re-usable encrypted passwords for user access. This means it can serve as a portal for malicious user account grinding purposes. The FTP Bounce method can be used through this port. This allows remote users to redirect FTP requests to other IPs and ports through the FTP server for malicious purposes. Other malicious purposes facilitated by remote users through port 21 include email forgery, network data flooding, and internal network data scanning methods. To learn more about errors in your system run a free registry scan.
Services or applications using this port:Service Control Port
Malicious services / applications:Port 21 is susceptible to hacker attacks intended for service rerouting or data forging and mining.
Port 21 details:
Protocol:
UDP
IAMA status:
Official
Range:
Registered
Traffic:
inbound, outbound
Notification:
True
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Technical description for port 21:
Port 21 is the main focus of rules embedded on built-in or third-party firewall applications. These firewall programs issue requests to the system for opening port 21 whenever necessary in order to properly facilitate data transfers. However, non-FTP servers cannot access this port 21 functionality. Only static rerouting methods to internal network FTP servers are provided by port 21 to non-FTP servers.
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