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// Other services

Port 3703: Adobe Server 3

Port 3703 is assigned by IANA to adobeserver-3 (Adobe Server 3).

3703

How adobeserver-3 works

Other services
client:3703adobeserver-3response client:3703adobeserver-3response

The client sends a request to port 3703 and the adobeserver-3 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 3703 dangerous?

We have no specific security note for port 3703. 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 3703

ServicePortTransportDescriptionReferenceUpdated
adobeserver-3 3703 TCP, UDP Adobe Server 3 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3703, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3703'      # process listening on 3703
sudo lsof -nP -i :3703

macOS

sudo lsof -nP -i :3703

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3703 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3703
netstat -ano | findstr :3703

From another machine

nmap -p 3703 -sV <host>
sudo nmap -sU -p 3703 <host>
nc -zv <host> 3703

Block it in the firewall

sudo ufw deny 3703/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3703" -Direction Inbound -LocalPort 3703 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3703 used for?

Port 3703 is assigned by IANA to adobeserver-3 (Adobe Server 3).

Is port 3703 TCP or UDP?

Port 3703 is registered for TCP and UDP.

Is it safe to open port 3703?

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 3703 is open?

On Linux run "ss -ltnup 'sport = :3703'", on macOS "lsof -nP -i :3703", and on Windows "netstat -ano | findstr :3703" to see the local process. From another machine, "nmap -p 3703 <host>" shows whether it is reachable.

05 Related
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