Port 9101 (bacula-dir)

IANA assigns port 9101 to bacula-dir: Bacula Director.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

bacula-dir TCP Bacula Director Kern Sibbald -

bacula-dir UDP Bacula Director Kern Sibbald -

Registry dates for this port: registered 2002-01.

Linux: is anything listening on TCP 9101?

sudo ss -tlnp 'sport = :9101'

Linux: UDP 9101

sudo ss -ulnp 'sport = :9101'

Linux / macOS: which process owns the port

sudo lsof -nP -i :9101

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':9101 '

Windows (Command Prompt)

netstat -ano | findstr :9101

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9101 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 9101

From Windows

Test-NetConnection HOST -Port 9101

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 9101

ufw

sudo ufw deny 9101/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 9101 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 9101 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 9101' -Direction Inbound -Protocol TCP -LocalPort 9101 -Action Block

ufw

sudo ufw deny 9101/udp

iptables

sudo iptables -A INPUT -p udp --dport 9101 -j DROP

nftables

sudo nft add rule inet filter input udp dport 9101 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 9101' -Direction Inbound -Protocol UDP -LocalPort 9101 -Action Block

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