CyberHunter
Local dataset, no network
// Other services

Port 9101: Bacula Director

Port 9101 is assigned by IANA to bacula-dir (Bacula Director).

9101

How bacula-dir works

Other services
client:9101bacula-dirresponse client:9101bacula-dirresponse

The client sends a request to port 9101 and the bacula-dir 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 9101 dangerous?

We have no specific security note for port 9101. 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 9101

ServicePortTransportDescriptionReferenceUpdated
bacula-dir 9101 TCP, UDP Bacula Director - 2002-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 9101, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9101'      # process listening on 9101
sudo lsof -nP -i :9101

macOS

sudo lsof -nP -i :9101

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9101 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9101
netstat -ano | findstr :9101

From another machine

nmap -p 9101 -sV <host>
sudo nmap -sU -p 9101 <host>
nc -zv <host> 9101

Block it in the firewall

sudo ufw deny 9101/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9101" -Direction Inbound -LocalPort 9101 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9101 used for?

Port 9101 is assigned by IANA to bacula-dir (Bacula Director).

Is port 9101 TCP or UDP?

Port 9101 is registered for TCP and UDP.

Is it safe to open port 9101?

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 9101 is open?

On Linux run "ss -ltnup 'sport = :9101'", on macOS "lsof -nP -i :9101", and on Windows "netstat -ano | findstr :9101" to see the local process. From another machine, "nmap -p 9101 <host>" shows whether it is reachable.

05 Related
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