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Port 259 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
259 tcp,udp applications FW1 VPN

Check Point VPN-1/FireWall-1 4.1 base.def contains a default macro, accept_fw1_rdp, which can allow remote attackers to bypass intended restrictions with forged RDP (internal protocol) headers to UDP port 259 of arbitrary hosts.
References: [CVE-2001-1158], [BID-2952]

Check Point ports:
259 udp - MEP configuration
264 tcp - Topology download
500 tcp/udp - IKE
2746 udp - UDP Encapsulation.
18231 tcp - Policy Server logon, when the client is inside the network
18232 tcp - Distribution server when the client is inside the network
18233 udp - Keep-alive protocol when the client is inside the network
18234 udp - Performing tunnel test, when the client is inside the network
18264 tcp - ICA certificate registration
259 tcp,udp ESRO, Efficient Short Remote Operations (official) Wikipedia
259 udp cp-config Check Point FW-1 Nokia P-1 VPN-1 SANS
259 tcp esro-gen efficient short remote operations Nmap
259 udp firewall1-rdp Firewall 1 proprietary RDP protocol Nmap
259 tcp fw1-clntauth Check Point FW-1/VPN-1 client auth Neophasis
259 udp fw1-rdp Check Point FW-1/VPN-1 key negotiations over RDP Neophasis
259 tcp,udp esro-gen Efficient Short Remote Operations IANA
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Related ports: 264  500  2746  18231  18264  

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External Resources
SANS Internet Storm Center: port 259

Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify a specific process, or network service. IANA is responsible for internet protocol resources, including the registration of commonly used port numbers for well-known internet services.
Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.

TCP ports use the Transmission Control Protocol, the most commonly used protocol on the Internet and any TCP/IP network. 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. Like TCP, UDP is used in combination with IP (the Internet Protocol) and facilitates 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 and realtime gaming, 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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