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Port 3735 (pwdis)

IANA assigns port 3735 to pwdis: Password Distribution.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pwdis TCP Password Distribution Robert Erl -
pwdis UDP Password Distribution Robert Erl -

Registry dates for this port: registered 2003-04.

Check what is listening on port 3735

Linux: is anything listening on TCP 3735?
sudo ss -tlnp 'sport = :3735'
Linux: UDP 3735
sudo ss -ulnp 'sport = :3735'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3735
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3735 '
Windows (Command Prompt)
netstat -ano | findstr :3735
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3735 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3735
From Windows
Test-NetConnection HOST -Port 3735
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3735

Block port 3735 in the firewall

ufw
sudo ufw deny 3735/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3735 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3735 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3735' -Direction Inbound -Protocol TCP -LocalPort 3735 -Action Block
ufw
sudo ufw deny 3735/udp
iptables
sudo iptables -A INPUT -p udp --dport 3735 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3735 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3735' -Direction Inbound -Protocol UDP -LocalPort 3735 -Action Block

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