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// Other services

Port 5504: fcp-cics-gw1

Port 5504 is assigned by IANA to fcp-cics-gw1 (fcp-cics-gw1).

5504

How fcp-cics-gw1 works

Other services
client:5504fcp-cics-gw1response client:5504fcp-cics-gw1response

The client sends a request to port 5504 and the fcp-cics-gw1 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 5504 dangerous?

We have no specific security note for port 5504. 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 5504

ServicePortTransportDescriptionReferenceUpdated
fcp-cics-gw1 5504 TCP, UDP fcp-cics-gw1 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5504, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5504'      # process listening on 5504
sudo lsof -nP -i :5504

macOS

sudo lsof -nP -i :5504

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5504 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5504
netstat -ano | findstr :5504

From another machine

nmap -p 5504 -sV <host>
sudo nmap -sU -p 5504 <host>
nc -zv <host> 5504

Block it in the firewall

sudo ufw deny 5504/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5504" -Direction Inbound -LocalPort 5504 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5504 used for?

Port 5504 is assigned by IANA to fcp-cics-gw1 (fcp-cics-gw1).

Is port 5504 TCP or UDP?

Port 5504 is registered for TCP and UDP.

Is it safe to open port 5504?

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 5504 is open?

On Linux run "ss -ltnup 'sport = :5504'", on macOS "lsof -nP -i :5504", and on Windows "netstat -ano | findstr :5504" to see the local process. From another machine, "nmap -p 5504 <host>" shows whether it is reachable.

05 Related
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