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// Other services

Port 4502: A25 (FAP-FGW)

Port 4502 is assigned by IANA to a25-fap-fgw (A25 (FAP-FGW)).

4502

How a25-fap-fgw works

Other services
client:4502a25-fap-fgwresponse client:4502a25-fap-fgwresponse

The client sends a request to port 4502 and the a25-fap-fgw service answers.

Transport
SCTP
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 4502 dangerous?

We have no specific security note for port 4502. 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 4502

ServicePortTransportDescriptionReferenceUpdated
a25-fap-fgw 4502 SCTP A25 (FAP-FGW) - 2012-01-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 4502, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4502'      # process listening on 4502
sudo lsof -nP -i :4502

macOS

sudo lsof -nP -i :4502

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4502 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4502
netstat -ano | findstr :4502

From another machine

nmap -p 4502 -sV <host>
nc -zv <host> 4502

Block it in the firewall

sudo ufw deny 4502/sctp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4502" -Direction Inbound -LocalPort 4502 -Protocol SCTP -Action Block  # Windows
04 FAQ
What is port 4502 used for?

Port 4502 is assigned by IANA to a25-fap-fgw (A25 (FAP-FGW)).

Is port 4502 TCP or UDP?

Port 4502 is registered for SCTP.

Is it safe to open port 4502?

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 4502 is open?

On Linux run "ss -ltnup 'sport = :4502'", on macOS "lsof -nP -i :4502", and on Windows "netstat -ano | findstr :4502" to see the local process. From another machine, "nmap -p 4502 <host>" shows whether it is reachable.

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