CyberHunter
Local dataset, no network
// Other services

Port 9103: Bacula Storage Daemon

Port 9103 is assigned by IANA to bacula-sd (Bacula Storage Daemon).

9103

How bacula-sd works

Other services
client:9103bacula-sdresponse client:9103bacula-sdresponse

The client sends a request to port 9103 and the bacula-sd 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 9103 dangerous?

We have no specific security note for port 9103. 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 9103

ServicePortTransportDescriptionReferenceUpdated
bacula-sd 9103 TCP, UDP Bacula Storage Daemon - 2002-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 9103, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9103'      # process listening on 9103
sudo lsof -nP -i :9103

macOS

sudo lsof -nP -i :9103

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9103 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9103
netstat -ano | findstr :9103

From another machine

nmap -p 9103 -sV <host>
sudo nmap -sU -p 9103 <host>
nc -zv <host> 9103

Block it in the firewall

sudo ufw deny 9103/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9103" -Direction Inbound -LocalPort 9103 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9103 used for?

Port 9103 is assigned by IANA to bacula-sd (Bacula Storage Daemon).

Is port 9103 TCP or UDP?

Port 9103 is registered for TCP and UDP.

Is it safe to open port 9103?

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 9103 is open?

On Linux run "ss -ltnup 'sport = :9103'", on macOS "lsof -nP -i :9103", and on Windows "netstat -ano | findstr :9103" to see the local process. From another machine, "nmap -p 9103 <host>" shows whether it is reachable.

05 Related
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