Port 9203WAP Secure Session Service

Legacy WAP 1.x secure session service, using WTLS to protect WSP sessions carried over WTP.

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

also known as wap-wsp-wtp-s, WAP WSP/WTP secure

Technical Details

what runs on :9203

Port 9203 is assigned to the WAP secure session service: a connection-oriented WAP session using WSP (Wireless Session Protocol) over WTP (Wireless Transaction Protocol), protected by WTLS (Wireless Transport Layer Security). WTLS provides a handshake and encrypted records; WAP stacks commonly carried this protocol over UDP, while IANA lists both UDP and TCP for the service. It is part of the legacy WAP protocol family, alongside the non-secure session service on 9201 and secure connectionless service on 9202.

Security Information

exposure of :9203

risk score

2/ 10safe

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

network services averages 2.6 across 1,839 ports — this one sits 0.6 below.

in transit

encrypted

payloads are protected on the wire

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 listener is likely to be a legacy WAP endpoint or gateway, not a current general-purpose web service. WTLS is intended to protect the session, but obsolete WAP stacks and gateway deployments may be unmaintained; avoid exposing one publicly unless it is required, and restrict access to trusted networks.

Record

iana registry entry

port: :9203
service: WAP Secure Session Service
transport: TCPUDP
encryption: tls / encrypted
assignment: iana registered
risk: 2/10safe
category: Network Services Mobile
usage: This is the WAP Forum's secure WAP session assignment, used by legacy WAP 1.x mobile devices and gateways rather than modern web clients. It is now rarely encountered; nmap's scan data has not observed it open.
lookups: 0rank 993
added: 2026-10-15
updated: 2026-10-15
references: IANA service name registry — port 9203

Something wrong?

This record is maintained by the engineers who use port 9203. 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 2026-10-15.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

Related Ports

all 1,839 in network services →

the 8 most looked-up other ports in network services — 1,839 ports carry that label.

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:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
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:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :9203WAP Secure Session Service

Technical Details

Security Information

Related Ports

Port 9203WAP Secure Session Service