Port 2821Veritas Authentication Service

Port 2821 is assigned to the Veritas Authentication Service over TCP and UDP.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

also known as vrts-at-port

Technical Details

what runs on :2821

Veritas Authentication Service is registered on port :2821 over tcp and udp to Stefan Winkel. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is found open rarely. What's listening is often not the registered service, so check before you assume.

find what's listening on :2821

this machine

# linux
sudo ss -tulpn 'sport = :2821'

# macos / bsd
sudo lsof -nP -i :2821

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :2821

another host

nmap -sV -p T:2821 <host>
sudo nmap -sU -sV -p U:2821 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :2821

risk score

1/ 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 367 ports — this one sits 2.1 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

no security notes recorded for :2821 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :2821
service: Veritas Authentication Service
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Security System
usage: This assignment identifies TCP and UDP port 2821 with the Veritas Authentication Service. The registry attributes the assignment to Stefan Winkel; public usage details are limited, and internet-wide scans rarely find it open.
lookups: 0rank 993
added: 2026-08-24
updated: 2026-08-24
references: IANA service name registry — port 2821

Something wrong?

This record is maintained by the engineers who use port 2821. 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 2026-08-24.

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 367 in security →

the 8 most looked-up other ports in security — 367 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	TCP	Web Services	caution	44.9k
:7000	Vuze HTTPS Tracker	TCPtls	Security	caution	28.9k

risk mix of the 8 listed

caution100%

2 of 8 encrypted

Port :2821Veritas Authentication Service

Technical Details

Security Information

Related Ports

Port 2821Veritas Authentication Service