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Port 5403 (hpoms-ci-lstn)

IANA assigns port 5403 to hpoms-ci-lstn: HPOMS-CI-LSTN.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
hpoms-ci-lstn TCP HPOMS-CI-LSTN Harold Froehling -
hpoms-ci-lstn UDP HPOMS-CI-LSTN Harold Froehling -

Check what is listening on port 5403

Linux: is anything listening on TCP 5403?
sudo ss -tlnp 'sport = :5403'
Linux: UDP 5403
sudo ss -ulnp 'sport = :5403'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5403
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5403 '
Windows (Command Prompt)
netstat -ano | findstr :5403
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5403 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5403
From Windows
Test-NetConnection HOST -Port 5403
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5403

Block port 5403 in the firewall

ufw
sudo ufw deny 5403/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5403 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5403 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5403' -Direction Inbound -Protocol TCP -LocalPort 5403 -Action Block
ufw
sudo ufw deny 5403/udp
iptables
sudo iptables -A INPUT -p udp --dport 5403 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5403 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5403' -Direction Inbound -Protocol UDP -LocalPort 5403 -Action Block

Related ports

5401excerpts5402mftp5404hpoms-dps-lstn5405netsupport

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