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// Other services

Port 8555: SYMAX D-FENCE

Port 8555 is assigned by IANA to d-fence (SYMAX D-FENCE).

8555

How d-fence works

Other services
client:8555d-fenceresponse client:8555d-fenceresponse

The client sends a request to port 8555 and the d-fence 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 8555 dangerous?

We have no specific security note for port 8555. 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 8555

ServicePortTransportDescriptionReferenceUpdated
d-fence 8555 TCP, UDP SYMAX D-FENCE - 2003-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 8555, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8555'      # process listening on 8555
sudo lsof -nP -i :8555

macOS

sudo lsof -nP -i :8555

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8555 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8555
netstat -ano | findstr :8555

From another machine

nmap -p 8555 -sV <host>
sudo nmap -sU -p 8555 <host>
nc -zv <host> 8555

Block it in the firewall

sudo ufw deny 8555/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8555" -Direction Inbound -LocalPort 8555 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8555 used for?

Port 8555 is assigned by IANA to d-fence (SYMAX D-FENCE).

Is port 8555 TCP or UDP?

Port 8555 is registered for TCP and UDP.

Is it safe to open port 8555?

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 8555 is open?

On Linux run "ss -ltnup 'sport = :8555'", on macOS "lsof -nP -i :8555", and on Windows "netstat -ano | findstr :8555" to see the local process. From another machine, "nmap -p 8555 <host>" shows whether it is reachable.

05 Related
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