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// Other services

Port 2399: FileMaker, Inc. - Data Access Layer

Port 2399 is assigned by IANA to fmpro-fdal (FileMaker, Inc. - Data Access Layer).

2399

How fmpro-fdal works

Other services
client:2399fmpro-fdalresponse client:2399fmpro-fdalresponse

The client sends a request to port 2399 and the fmpro-fdal 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 2399 dangerous?

We have no specific security note for port 2399. 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 2399

ServicePortTransportDescriptionReferenceUpdated
fmpro-fdal 2399 TCP, UDP FileMaker, Inc. - Data Access Layer - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2399, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2399'      # process listening on 2399
sudo lsof -nP -i :2399

macOS

sudo lsof -nP -i :2399

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2399 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2399
netstat -ano | findstr :2399

From another machine

nmap -p 2399 -sV <host>
sudo nmap -sU -p 2399 <host>
nc -zv <host> 2399

Block it in the firewall

sudo ufw deny 2399/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2399" -Direction Inbound -LocalPort 2399 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2399 used for?

Port 2399 is assigned by IANA to fmpro-fdal (FileMaker, Inc. - Data Access Layer).

Is port 2399 TCP or UDP?

Port 2399 is registered for TCP and UDP.

Is it safe to open port 2399?

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 2399 is open?

On Linux run "ss -ltnup 'sport = :2399'", on macOS "lsof -nP -i :2399", and on Windows "netstat -ano | findstr :2399" to see the local process. From another machine, "nmap -p 2399 <host>" shows whether it is reachable.

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