Port 3761Group Secure Association Key Management Protocol (GSAKMP)

GSAKMP is a protocol for creating and managing cryptographic groups, including multicast group key management.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

also known as gsakmp

Technical Details

what runs on :3761

GSAKMP is specified in RFC 4535 and uses group controller/key server and group-member roles to establish and manage group security associations. IANA lists both TCP and UDP on port 3761, but there is no widely established implementation or deployment default to infer from an open port alone. It uses protocol-specific control messages and cryptographic mechanisms for authentication and key management; it is not simply a TLS service, and a port probe should not be expected to return a familiar application banner.

Security Information

exposure of :3761

risk score

2/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

security averages 3.1 across 361 ports — this one sits 1.1 below.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

A genuine GSAKMP listener would be part of group key-management infrastructure, so restrict access to intended participants and management peers rather than exposing it broadly. The protocol's cryptographic design does not make an unrecognized listener harmless: verify the process and configuration, and treat unexpected exposure as a reason to investigate. The port is obscure and has not been observed open in the cited scan data.

Record

iana registry entry

port: :3761
service: Group Secure Association Key Management Protocol (GSAKMP)
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Security Network Services
usage: The assignment names GSAKMP, a standardized protocol for establishing and managing security associations and keys for groups, including multicast applications. It is a specialized protocol rather than a commonly encountered general-purpose listener, and internet-wide scan data has not observed it open.
lookups: 0rank 993
added: 2026-10-01
updated: 2026-10-01
references: IANA service name registry — port 3761
RFC 4535

Something wrong?

This record is maintained by the engineers who use port 3761. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-01.

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edit this record →back to the registry

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risk mix of the 8 listed

caution100%

2 of 8 encrypted

Port :3761Group Secure Association Key Management Protocol (GSAKMP)

Technical Details

Security Information

Related Ports

Port 3761Group Secure Association Key Management Protocol (GSAKMP)