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Port 9103 (bacula-sd)

IANA assigns port 9103 to bacula-sd: Bacula Storage Daemon.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
bacula-sd TCP Bacula Storage Daemon Kern Sibbald -
bacula-sd UDP Bacula Storage Daemon Kern Sibbald -

Registry dates for this port: registered 2002-01.

Check what is listening on port 9103

Linux: is anything listening on TCP 9103?
sudo ss -tlnp 'sport = :9103'
Linux: UDP 9103
sudo ss -ulnp 'sport = :9103'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9103
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9103 '
Windows (Command Prompt)
netstat -ano | findstr :9103
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9103 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9103
From Windows
Test-NetConnection HOST -Port 9103
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9103

Block port 9103 in the firewall

ufw
sudo ufw deny 9103/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9103 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9103 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9103' -Direction Inbound -Protocol TCP -LocalPort 9103 -Action Block
ufw
sudo ufw deny 9103/udp
iptables
sudo iptables -A INPUT -p udp --dport 9103 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9103 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9103' -Direction Inbound -Protocol UDP -LocalPort 9103 -Action Block

Related ports

9101bacula-dir9102bacula-fd9104peerwire9105xadmin

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.