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Port 1333 (passwrd-policy)

IANA assigns port 1333 to passwrd-policy: Password Policy.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
passwrd-policy TCP Password Policy Tonio Pirotta -
passwrd-policy UDP Password Policy Tonio Pirotta -

Check what is listening on port 1333

Linux: is anything listening on TCP 1333?
sudo ss -tlnp 'sport = :1333'
Linux: UDP 1333
sudo ss -ulnp 'sport = :1333'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1333
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1333 '
Windows (Command Prompt)
netstat -ano | findstr :1333
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1333 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1333
From Windows
Test-NetConnection HOST -Port 1333
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1333

Block port 1333 in the firewall

ufw
sudo ufw deny 1333/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1333 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1333 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1333' -Direction Inbound -Protocol TCP -LocalPort 1333 -Action Block
ufw
sudo ufw deny 1333/udp
iptables
sudo iptables -A INPUT -p udp --dport 1333 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1333 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1333' -Direction Inbound -Protocol UDP -LocalPort 1333 -Action Block

Related ports

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