Port 4537WSS Security Service

IANA-assigned port for the WSS Security Service.

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

also known as wssauthsvc

Technical Details

what runs on :4537

WSS Security Service is registered on port :4537 over tcp and udp to Mark Tirschwell, assigned January 2006. 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 :4537

this machine

# linux
sudo ss -tulpn 'sport = :4537'

# macos / bsd
sudo lsof -nP -i :4537

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :4537

another host

nmap -sV -p T:4537 <host>
sudo nmap -sU -sV -p U:4537 <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 :4537

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 348 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 :4537 yet

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

Record

iana registry entry

port: :4537
service: WSS Security Service
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Security
usage: TCP and UDP port 4537 is assigned to the WSS Security Service. The assignment was registered by Mark Tirschwell in 2006, but public deployment and protocol details are not established here.
lookups: 0rank 993
added: 2026-09-06
updated: 2026-09-06
references: IANA service name registry — port 4537

Something wrong?

This record is maintained by the engineers who use port 4537. 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 2026-09-06.

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 348 in security →

the 8 most looked-up other ports in security — 348 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 :4537WSS Security Service

Technical Details

Security Information

Related Ports

Port 4537WSS Security Service