CyberHunter
Local dataset, no network
// Other services

Port 2004: CCWS mm conf

Port 2004 is assigned by IANA to emce (CCWS mm conf), mailbox ().

2004

How emce works

Other services
client:2004emceresponse client:2004emceresponse

The client sends a request to port 2004 and the emce service answers.

Transport
UDP · TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 2004 dangerous?

We have no specific security note for port 2004. 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 2004

ServicePortTransportDescriptionReferenceUpdated
emce 2004 UDP CCWS mm conf - -
mailbox 2004 TCP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2004, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2004'      # process listening on 2004
sudo lsof -nP -i :2004

macOS

sudo lsof -nP -i :2004

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2004 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2004
netstat -ano | findstr :2004

From another machine

nmap -p 2004 -sV <host>
sudo nmap -sU -p 2004 <host>
nc -zv <host> 2004

Block it in the firewall

sudo ufw deny 2004/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2004" -Direction Inbound -LocalPort 2004 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2004 used for?

Port 2004 is assigned by IANA to emce (CCWS mm conf), mailbox ().

Is port 2004 TCP or UDP?

Port 2004 is registered for UDP and TCP.

Is it safe to open port 2004?

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 2004 is open?

On Linux run "ss -ltnup 'sport = :2004'", on macOS "lsof -nP -i :2004", and on Windows "netstat -ano | findstr :2004" to see the local process. From another machine, "nmap -p 2004 <host>" shows whether it is reachable.

05 Related
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