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Port 9203 (wap-wsp-wtp-s)

IANA assigns port 9203 to wap-wsp-wtp-s: WAP secure session service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
wap-wsp-wtp-s TCP WAP secure session service WAP Forum -
wap-wsp-wtp-s UDP WAP secure session service WAP Forum -

Check what is listening on port 9203

Linux: is anything listening on TCP 9203?
sudo ss -tlnp 'sport = :9203'
Linux: UDP 9203
sudo ss -ulnp 'sport = :9203'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9203
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9203 '
Windows (Command Prompt)
netstat -ano | findstr :9203
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9203 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9203
From Windows
Test-NetConnection HOST -Port 9203
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9203

Block port 9203 in the firewall

ufw
sudo ufw deny 9203/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9203 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9203 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9203' -Direction Inbound -Protocol TCP -LocalPort 9203 -Action Block
ufw
sudo ufw deny 9203/udp
iptables
sudo iptables -A INPUT -p udp --dport 9203 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9203 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9203' -Direction Inbound -Protocol UDP -LocalPort 9203 -Action Block

Related ports

9201wap-wsp-wtp9202wap-wsp-s9204wap-vcard9205wap-vcal

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.