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Port 38203 (agpolicy)

IANA assigns port 38203 to agpolicy: AppGate Policy Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
agpolicy TCP AppGate Policy Server Martin Forssen -
agpolicy UDP AppGate Policy Server Martin Forssen -

Registry dates for this port: registered 2004-11.

Check what is listening on port 38203

Linux: is anything listening on TCP 38203?
sudo ss -tlnp 'sport = :38203'
Linux: UDP 38203
sudo ss -ulnp 'sport = :38203'
Linux / macOS: which process owns the port
sudo lsof -nP -i :38203
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':38203 '
Windows (Command Prompt)
netstat -ano | findstr :38203
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 38203 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 38203
From Windows
Test-NetConnection HOST -Port 38203
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 38203

Block port 38203 in the firewall

ufw
sudo ufw deny 38203/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 38203 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 38203 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 38203' -Direction Inbound -Protocol TCP -LocalPort 38203 -Action Block
ufw
sudo ufw deny 38203/udp
iptables
sudo iptables -A INPUT -p udp --dport 38203 -j DROP
nftables
sudo nft add rule inet filter input udp dport 38203 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 38203' -Direction Inbound -Protocol UDP -LocalPort 38203 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.