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// Other services

Port 5003: FileMaker, Inc. - Proprietary transport

Port 5003 is assigned by IANA to fmpro-internal (FileMaker, Inc. - Proprietary transport).

5003

How fmpro-internal works

Other services
client:5003fmpro-internalresponse client:5003fmpro-internalresponse

The client sends a request to port 5003 and the fmpro-internal 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 5003 dangerous?

We have no specific security note for port 5003. 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 5003

ServicePortTransportDescriptionReferenceUpdated
fmpro-internal 5003 TCP, UDP FileMaker, Inc. - Proprietary transport - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5003, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5003'      # process listening on 5003
sudo lsof -nP -i :5003

macOS

sudo lsof -nP -i :5003

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5003 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5003
netstat -ano | findstr :5003

From another machine

nmap -p 5003 -sV <host>
sudo nmap -sU -p 5003 <host>
nc -zv <host> 5003

Block it in the firewall

sudo ufw deny 5003/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5003" -Direction Inbound -LocalPort 5003 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5003 used for?

Port 5003 is assigned by IANA to fmpro-internal (FileMaker, Inc. - Proprietary transport).

Is port 5003 TCP or UDP?

Port 5003 is registered for TCP and UDP.

Is it safe to open port 5003?

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 5003 is open?

On Linux run "ss -ltnup 'sport = :5003'", on macOS "lsof -nP -i :5003", and on Windows "netstat -ano | findstr :5003" to see the local process. From another machine, "nmap -p 5003 <host>" shows whether it is reachable.

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