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Port 4321 Details

known port assignments and vulnerabilities
threat/application/port search:
Port(s) Protocol Service Details Source
4321 tcp trojans BoBo, Schoolbus 1.0 trojans

Command & Conquer: Red Alert 3 also uses this port.

WRPCServer.exe in WinSoftMagic WinRemotePC (WRPC) Lite 2008 and Full 2008 allows remote attackers to cause a denial of service (CPU consumption) via a crafted packet to TCP port 4321.
References: [CVE-2008-3269], [BID-30236]

Remote Who Is (TCP/UDP) [RFC 2167] (IANA official)
4321 tcp trojan [trojan] BoBo Trojans
4321 tcp,udp rwhois Remote Who Is IANA
4321 tcp BoBo [trojan] BoBo SANS
4321,27900 udp applications Command and Conquer Generals Portforward
4321,27900 udp applications Command and Conquer Generals GameSpy Portforward
80, 3783, 4321, 6660-6669, 28900, 29900, 2901 tcp applications Command and Conquer Red Alert 3 Portforward
4321,27900 udp applications Command and Conquer Zero Hour Portforward
4321,27900 udp applications Command and Conquer Zero Hour GameSpy Portforward
9 records found
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Related ports: 3783  

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External Resources
SANS Internet Storm Center: port 4321

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.

When troubleshooting unknown open ports, it is useful to find exactly what services/processes are listening to them. This can be accomplished in both Windows command prompt and Linux variants using the "netstat -aon" command. We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software. For more detailed and personalized help please use our forums.

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