CyberHunter
Local dataset, no network
// Other services

Port 3104: Autocue Logger Protocol

Port 3104 is assigned by IANA to autocuelog (Autocue Logger Protocol), autocuetime (Autocue Time Service).

3104

How autocuelog works

Other services
client:3104autocuelogresponse client:3104autocuelogresponse

The client sends a request to port 3104 and the autocuelog service answers.

Transport
TCP · UDP
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 3104 dangerous?

We have no specific security note for port 3104. 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 3104

ServicePortTransportDescriptionReferenceUpdated
autocuelog 3104 TCP Autocue Logger Protocol - -
autocuetime 3104 UDP Autocue Time Service - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3104, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3104'      # process listening on 3104
sudo lsof -nP -i :3104

macOS

sudo lsof -nP -i :3104

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3104 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3104
netstat -ano | findstr :3104

From another machine

nmap -p 3104 -sV <host>
sudo nmap -sU -p 3104 <host>
nc -zv <host> 3104

Block it in the firewall

sudo ufw deny 3104/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3104" -Direction Inbound -LocalPort 3104 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3104 used for?

Port 3104 is assigned by IANA to autocuelog (Autocue Logger Protocol), autocuetime (Autocue Time Service).

Is port 3104 TCP or UDP?

Port 3104 is registered for TCP and UDP.

Is it safe to open port 3104?

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 3104 is open?

On Linux run "ss -ltnup 'sport = :3104'", on macOS "lsof -nP -i :3104", and on Windows "netstat -ano | findstr :3104" to see the local process. From another machine, "nmap -p 3104 <host>" shows whether it is reachable.

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