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// Other services

Port 3704: Adobe Server 4

Port 3704 is assigned by IANA to adobeserver-4 (Adobe Server 4).

3704

How adobeserver-4 works

Other services
client:3704adobeserver-4response client:3704adobeserver-4response

The client sends a request to port 3704 and the adobeserver-4 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 3704 dangerous?

We have no specific security note for port 3704. 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 3704

ServicePortTransportDescriptionReferenceUpdated
adobeserver-4 3704 TCP, UDP Adobe Server 4 - 2003-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 3704, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3704'      # process listening on 3704
sudo lsof -nP -i :3704

macOS

sudo lsof -nP -i :3704

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3704 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3704
netstat -ano | findstr :3704

From another machine

nmap -p 3704 -sV <host>
sudo nmap -sU -p 3704 <host>
nc -zv <host> 3704

Block it in the firewall

sudo ufw deny 3704/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3704" -Direction Inbound -LocalPort 3704 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3704 used for?

Port 3704 is assigned by IANA to adobeserver-4 (Adobe Server 4).

Is port 3704 TCP or UDP?

Port 3704 is registered for TCP and UDP.

Is it safe to open port 3704?

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 3704 is open?

On Linux run "ss -ltnup 'sport = :3704'", on macOS "lsof -nP -i :3704", and on Windows "netstat -ano | findstr :3704" to see the local process. From another machine, "nmap -p 3704 <host>" shows whether it is reachable.

05 Related
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