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// Databases & caches

Port 4999: HFSQL Client/Server Database Engine Manager

Port 4999 is assigned by IANA to hfcs-manager (HFSQL Client/Server Database Engine Manager).

4999

How hfcs-manager works

Databases & caches
app:4999hfcs-manager app:4999hfcs-manager

The application sends a SQL query to the hfcs-manager server on port 4999, which returns rows from its tables.

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
Databases & caches
01 Security

Is port 4999 dangerous?

We have no specific security note for port 4999. Its risk depends on the program actually listening on it. General advice for databases & caches services:

  • Bind the service to localhost or a private network, never to a public address.
  • Enable authentication, use per-application accounts and require TLS.
  • Watch for exposed Docker ports: publish them on 127.0.0.1 only.
02 Registry

IANA registry entries for port 4999

ServicePortTransportDescriptionReferenceUpdated
hfcs-manager 4999 TCP, UDP HFSQL Client/Server Database Engine Manager - 2014-02-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 4999, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4999'      # process listening on 4999
sudo lsof -nP -i :4999

macOS

sudo lsof -nP -i :4999

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4999 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4999
netstat -ano | findstr :4999

From another machine

nmap -p 4999 -sV <host>
sudo nmap -sU -p 4999 <host>
nc -zv <host> 4999

Block it in the firewall

sudo ufw deny 4999/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4999" -Direction Inbound -LocalPort 4999 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4999 used for?

Port 4999 is assigned by IANA to hfcs-manager (HFSQL Client/Server Database Engine Manager).

Is port 4999 TCP or UDP?

Port 4999 is registered for TCP and UDP.

Is it safe to open port 4999?

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. Bind the service to localhost or a private network, never to a public address.

How do I check if port 4999 is open?

On Linux run "ss -ltnup 'sport = :4999'", on macOS "lsof -nP -i :4999", and on Windows "netstat -ano | findstr :4999" to see the local process. From another machine, "nmap -p 4999 <host>" shows whether it is reachable.

05 Related
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