CyberHunter
Local dataset, no network
// Other services

Port 3806: Remote System Manager

Port 3806 is assigned by IANA to wsmlb (Remote System Manager).

3806

How wsmlb works

Other services
client:3806wsmlbresponse client:3806wsmlbresponse

The client sends a request to port 3806 and the wsmlb service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 3806 dangerous?

We have no specific security note for port 3806. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 3806

ServicePortTransportDescriptionReferenceUpdated
wsmlb 3806 TCP, UDP Remote System Manager - 2004-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 3806, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3806'      # process listening on 3806
sudo lsof -nP -i :3806

macOS

sudo lsof -nP -i :3806

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3806 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3806
netstat -ano | findstr :3806

From another machine

nmap -p 3806 -sV <host>
sudo nmap -sU -p 3806 <host>
nc -zv <host> 3806

Block it in the firewall

sudo ufw deny 3806/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3806" -Direction Inbound -LocalPort 3806 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3806 used for?

Port 3806 is assigned by IANA to wsmlb (Remote System Manager).

Is port 3806 TCP or UDP?

Port 3806 is registered for TCP and UDP.

Is it safe to open port 3806?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 3806 is open?

On Linux run "ss -ltnup 'sport = :3806'", on macOS "lsof -nP -i :3806", and on Windows "netstat -ano | findstr :3806" to see the local process. From another machine, "nmap -p 3806 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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