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Port 9093 (Prometheus Alertmanager)

Alertmanager web UI and API. Kafka setups also often use 9093 for a TLS or SASL listener.

Registered (user) port, 1024-49151 TCP Monitoring and logging Do not expose to the internet

What port 9093 is used for

Alertmanager web UI and API. Kafka setups also often use 9093 for a TLS or SASL listener.

Security: should port 9093 be open?

Do not expose to the internet. No auth by default; anyone reaching it can silence your alerts.

IANA assignment

Service nameProtoDescriptionAssigneeReference
copycat TCP Copycat database replication service Microtec Informatique -

Registry dates for this port: registered 2012-03-15.

Check what is listening on port 9093

Linux: is anything listening on TCP 9093?
sudo ss -tlnp 'sport = :9093'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9093
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9093 '
Windows (Command Prompt)
netstat -ano | findstr :9093
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9093 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9093
From Windows
Test-NetConnection HOST -Port 9093

Block port 9093 in the firewall

ufw
sudo ufw deny 9093/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9093 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9093 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9093' -Direction Inbound -Protocol TCP -LocalPort 9093 -Action Block

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9090Prometheus9092Apache Kafka9091Prometheus Pushgateway / Transmission9100node_exporter / printer raw (JetDirect)9101bacula-dir

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.