CyberHunter
Local dataset, no network
// Other services

Port 3879: appss license manager

Port 3879 is assigned by IANA to appss-lm (appss license manager).

3879

How appss-lm works

Other services
client:3879appss-lmresponse client:3879appss-lmresponse

The client sends a request to port 3879 and the appss-lm 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 3879 dangerous?

We have no specific security note for port 3879. 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 3879

ServicePortTransportDescriptionReferenceUpdated
appss-lm 3879 TCP, UDP appss license manager - 2003-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 3879, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3879'      # process listening on 3879
sudo lsof -nP -i :3879

macOS

sudo lsof -nP -i :3879

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3879 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3879
netstat -ano | findstr :3879

From another machine

nmap -p 3879 -sV <host>
sudo nmap -sU -p 3879 <host>
nc -zv <host> 3879

Block it in the firewall

sudo ufw deny 3879/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3879" -Direction Inbound -LocalPort 3879 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3879 used for?

Port 3879 is assigned by IANA to appss-lm (appss license manager).

Is port 3879 TCP or UDP?

Port 3879 is registered for TCP and UDP.

Is it safe to open port 3879?

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 3879 is open?

On Linux run "ss -ltnup 'sport = :3879'", on macOS "lsof -nP -i :3879", and on Windows "netstat -ano | findstr :3879" to see the local process. From another machine, "nmap -p 3879 <host>" shows whether it is reachable.

05 Related
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