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Port 3806 (wsmlb)

IANA assigns port 3806 to wsmlb: Remote System Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
wsmlb TCP Remote System Manager Thomas Fiege -
wsmlb UDP Remote System Manager Thomas Fiege -

Registry dates for this port: registered 2004-02.

Check what is listening on port 3806

Linux: is anything listening on TCP 3806?
sudo ss -tlnp 'sport = :3806'
Linux: UDP 3806
sudo ss -ulnp 'sport = :3806'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3806
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3806 '
Windows (Command Prompt)
netstat -ano | findstr :3806
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3806 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3806
From Windows
Test-NetConnection HOST -Port 3806
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3806

Block port 3806 in the firewall

ufw
sudo ufw deny 3806/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3806 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3806 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3806' -Direction Inbound -Protocol TCP -LocalPort 3806 -Action Block
ufw
sudo ufw deny 3806/udp
iptables
sudo iptables -A INPUT -p udp --dport 3806 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3806 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3806' -Direction Inbound -Protocol UDP -LocalPort 3806 -Action Block

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