CyberHunter
Local dataset, no network
// Other services

Port 5023: Htuil Server for PLD2

Port 5023 is assigned by IANA to htuilsrv (Htuil Server for PLD2).

5023

How htuilsrv works

Other services
client:5023htuilsrvresponse client:5023htuilsrvresponse

The client sends a request to port 5023 and the htuilsrv 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 5023 dangerous?

We have no specific security note for port 5023. 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 5023

ServicePortTransportDescriptionReferenceUpdated
htuilsrv 5023 TCP, UDP Htuil Server for PLD2 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5023, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5023'      # process listening on 5023
sudo lsof -nP -i :5023

macOS

sudo lsof -nP -i :5023

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5023 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5023
netstat -ano | findstr :5023

From another machine

nmap -p 5023 -sV <host>
sudo nmap -sU -p 5023 <host>
nc -zv <host> 5023

Block it in the firewall

sudo ufw deny 5023/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5023" -Direction Inbound -LocalPort 5023 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5023 used for?

Port 5023 is assigned by IANA to htuilsrv (Htuil Server for PLD2).

Is port 5023 TCP or UDP?

Port 5023 is registered for TCP and UDP.

Is it safe to open port 5023?

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 5023 is open?

On Linux run "ss -ltnup 'sport = :5023'", on macOS "lsof -nP -i :5023", and on Windows "netstat -ano | findstr :5023" to see the local process. From another machine, "nmap -p 5023 <host>" shows whether it is reachable.

05 Related
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