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// Other services

Port 4122: Fiber Patrol Alarm Service

Port 4122 is assigned by IANA to fprams (Fiber Patrol Alarm Service).

4122

How fprams works

Other services
client:4122fpramsresponse client:4122fpramsresponse

The client sends a request to port 4122 and the fprams 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 4122 dangerous?

We have no specific security note for port 4122. 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 4122

ServicePortTransportDescriptionReferenceUpdated
fprams 4122 TCP, UDP Fiber Patrol Alarm Service - 2006-12

// source: IANA service name and port number registry

03 Check it

Which program uses port 4122, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4122'      # process listening on 4122
sudo lsof -nP -i :4122

macOS

sudo lsof -nP -i :4122

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4122 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4122
netstat -ano | findstr :4122

From another machine

nmap -p 4122 -sV <host>
sudo nmap -sU -p 4122 <host>
nc -zv <host> 4122

Block it in the firewall

sudo ufw deny 4122/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4122" -Direction Inbound -LocalPort 4122 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4122 used for?

Port 4122 is assigned by IANA to fprams (Fiber Patrol Alarm Service).

Is port 4122 TCP or UDP?

Port 4122 is registered for TCP and UDP.

Is it safe to open port 4122?

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 4122 is open?

On Linux run "ss -ltnup 'sport = :4122'", on macOS "lsof -nP -i :4122", and on Windows "netstat -ano | findstr :4122" to see the local process. From another machine, "nmap -p 4122 <host>" shows whether it is reachable.

05 Related
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