Port 3799RADIUS Dynamic Authorization

RADIUS Dynamic Authorization for changing or terminating active network access sessions.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 6/10
lookups: 0

also known as radius-dynauth, RADIUS CoA, RADIUS Disconnect

Technical Details

what runs on :3799

RADIUS Dynamic Authorization is defined by RFC 5176 and normally uses UDP port 3799; the registry also assigns the service over TCP. Messages use the RADIUS packet format with a code, identifier, length, authenticator, and typed attributes, followed by a request/response exchange rather than a connection-oriented handshake. Requests are authenticated with a shared secret and commonly a Message-Authenticator attribute. Standard RADIUS authentication and accounting commonly use UDP ports 1812 and 1813.

Security Information

exposure of :3799

risk score

6/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

security averages 3.5 across 272 ports — this one sits 2.5 above.

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

Dynamic Authorization can change authorization state or disconnect active users, so an exposed endpoint is a sensitive control interface. It is not encrypted by default and should be restricted to trusted RADIUS peers with filtering, strong shared secrets, and message authentication; it should generally not be reachable from the public internet.

Record

iana registry entry

port: :3799
service: RADIUS Dynamic Authorization
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 6/10risk
category: Security Network Services
usage: Port 3799 carries RADIUS Dynamic Authorization messages, including Change of Authorization (CoA) and disconnect requests. Network access servers and RADIUS servers use it to modify or terminate active VPN, Wi-Fi, broadband, and other authenticated sessions.
lookups: 0rank 994
added: 2026-09-05
updated: 2026-09-05
references: IANA service name registry — port 3799
RFC 3576

Something wrong?

This record is maintained by the engineers who use port 3799. 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 2026-09-05.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 272 in security →

the 8 most looked-up other ports in security — 272 ports carry that label.

port	service	proto	category	risk	views
:8881	Atlasz Secure Server	TCP	Web Services	caution	67.6k
:443	HTTPS	TCPtls	Web Services	caution	65.9k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Squid Proxy HTTP	TCP	Web Services	caution	45.8k
:8080	HTTP Alternate	TCPtls	Web Services	caution	44.9k
:7000	Vuze HTTPS Tracker	TCPtls	Security	caution	28.9k

risk mix of the 8 listed

caution100%

3 of 8 encrypted

Port :3799RADIUS Dynamic Authorization

Technical Details

Security Information

Related Ports

Port 3799RADIUS Dynamic Authorization