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// Other services

Port 3978: Secured Configuration Server

Port 3978 is assigned by IANA to secure-cfg-svr (Secured Configuration Server).

3978

How secure-cfg-svr works

Other services
client:3978secure-cfg-svrresponse client:3978secure-cfg-svrresponse

The client sends a request to port 3978 and the secure-cfg-svr 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 3978 dangerous?

We have no specific security note for port 3978. 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 3978

ServicePortTransportDescriptionReferenceUpdated
secure-cfg-svr 3978 TCP, UDP Secured Configuration Server - 2006-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 3978, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3978'      # process listening on 3978
sudo lsof -nP -i :3978

macOS

sudo lsof -nP -i :3978

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3978 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3978
netstat -ano | findstr :3978

From another machine

nmap -p 3978 -sV <host>
sudo nmap -sU -p 3978 <host>
nc -zv <host> 3978

Block it in the firewall

sudo ufw deny 3978/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3978" -Direction Inbound -LocalPort 3978 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3978 used for?

Port 3978 is assigned by IANA to secure-cfg-svr (Secured Configuration Server).

Is port 3978 TCP or UDP?

Port 3978 is registered for TCP and UDP.

Is it safe to open port 3978?

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 3978 is open?

On Linux run "ss -ltnup 'sport = :3978'", on macOS "lsof -nP -i :3978", and on Windows "netstat -ano | findstr :3978" to see the local process. From another machine, "nmap -p 3978 <host>" shows whether it is reachable.

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