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Port 39999 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
39999 tcp trojans Trojan.Mitglieder.C - Mail Relay trojan, 01.20.2004. Affects all current Windows versions, listens on port 39999. Opens a mail relay on your computer (allowing others to use it to send unsolicited commercial email). The Trojan also downloads and executes PWSteal.Ldpinch. SG
39999 udp applications Symantec Endpoint Protection (SEP). Communication between the SEP clients and the Enforcer. This port is used for authentication of clients by the Enforcer.

Sygate Enforcer contains a flaw that may allow a remote denial of service. The issue is triggered when a remote attacker sends a specially crafted UDP packet from source port 39999 to destination source port 39999 on the Enforcer system, and will result in loss of availability for the Enforcer system.
References: [CVE-2003-0931], [XFDB-16949]
39999 tcp Proxy-Mitglieder [trojan] Proxy-MitGlieder SANS
39682-39999 tcp,udp Unassigned IANA
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Related ports: 2638  2967  8014  

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External Resources
SANS Internet Storm Center: port 39999

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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