Port 321 Details
known port assignments and vulnerabilities
3 records found
||W32.Looksky.A@mm (10.25.2005) - a mass-mailing worm that lowers security settings and logs keystrokes on the compromised computer. It also gathers and sends out personal information. Opens a backdoor and listens for remote commands on port 321/tcp. It also periodically connects to proxy4u.ws on port 8080/tcp to check for updates.
Port also used by other variants:
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SANS Internet Storm Center: port 321
Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.
TCP ports use the Transmission Control Protocol. TCP is the most commonly used protocol
on the Internet and any TCP/IP network. Whereas the IP protocol deals only with packets, TCP enables two hosts
to establish a connection and exchange streams of data. TCP guarantees delivery of data
and that packets will be delivered in the same order in which they were sent.
Guaranteed communication/delivery is the key difference between TCP and UDP.
UDP ports use the Datagram Protocol, a communications protocol for the Internet network,
transport, and session layers. Like TCP (Transmission Control Protocol),
UDP is used with IP (the Internet Protocol) and makes possible the transmission of datagrams
from one computer to applications on another computer, but unlike TCP, UDP is connectionless
and does not guarantee reliable communication; it's up to the application that received
the message to process any errors and verify correct delivery. UDP is often used with time-sensitive
applications, such as audio/video streaming, where dropping some packets is preferable to waiting for delayed data.
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