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// Other services

Port 704: errlog copy/server daemon

Port 704 is assigned by IANA to elcsd (errlog copy/server daemon).

704

How elcsd works

Other services
client:704elcsdresponse client:704elcsdresponse

The client sends a request to port 704 and the elcsd 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 704 dangerous?

We have no specific security note for port 704. 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 704

ServicePortTransportDescriptionReferenceUpdated
elcsd 704 TCP, UDP errlog copy/server daemon - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 704, and is it reachable?

Linux

sudo ss -ltnup 'sport = :704'      # process listening on 704
sudo lsof -nP -i :704

macOS

sudo lsof -nP -i :704

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 704 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 704
netstat -ano | findstr :704

From another machine

nmap -p 704 -sV <host>
sudo nmap -sU -p 704 <host>
nc -zv <host> 704

Block it in the firewall

sudo ufw deny 704/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 704" -Direction Inbound -LocalPort 704 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 704 used for?

Port 704 is assigned by IANA to elcsd (errlog copy/server daemon).

Is port 704 TCP or UDP?

Port 704 is registered for TCP and UDP.

Is it safe to open port 704?

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 704 is open?

On Linux run "ss -ltnup 'sport = :704'", on macOS "lsof -nP -i :704", and on Windows "netstat -ano | findstr :704" to see the local process. From another machine, "nmap -p 704 <host>" shows whether it is reachable.

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