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// Other services

Port 3979: Smith Micro Wide Area Network Service

Port 3979 is assigned by IANA to smwan (Smith Micro Wide Area Network Service).

3979

How smwan works

Other services
client:3979smwanresponse client:3979smwanresponse

The client sends a request to port 3979 and the smwan 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 3979 dangerous?

We have no specific security note for port 3979. 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 3979

ServicePortTransportDescriptionReferenceUpdated
smwan 3979 TCP, UDP Smith Micro Wide Area Network Service - 2006-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 3979, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3979'      # process listening on 3979
sudo lsof -nP -i :3979

macOS

sudo lsof -nP -i :3979

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3979 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3979
netstat -ano | findstr :3979

From another machine

nmap -p 3979 -sV <host>
sudo nmap -sU -p 3979 <host>
nc -zv <host> 3979

Block it in the firewall

sudo ufw deny 3979/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3979" -Direction Inbound -LocalPort 3979 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3979 used for?

Port 3979 is assigned by IANA to smwan (Smith Micro Wide Area Network Service).

Is port 3979 TCP or UDP?

Port 3979 is registered for TCP and UDP.

Is it safe to open port 3979?

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 3979 is open?

On Linux run "ss -ltnup 'sport = :3979'", on macOS "lsof -nP -i :3979", and on Windows "netstat -ano | findstr :3979" to see the local process. From another machine, "nmap -p 3979 <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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