Network Port: 3306
Network Port Reference Guide
Registered Service Name
MySQL Database
Transport Protocol
TCP
Functional Overview
Port 3306 is the standard default port for MySQL and MariaDB database server connections.
Security Risks & Vulnerabilities
Critical asset target. Exploitation of MySQL authentication bypasses or vulnerabilities can result in total data leaks. Bind MySQL to localhost (127.0.0.1) or lock down firewall routing.
How to audit network port status
1. Scan Open Ports: Use our Port Scanner utility to verify if this port is actively listening on your host.
2. Verify Encryption: Audit the service layer to confirm SSL/TLS is protecting transmission payload.
3. Hardening Rules: Apply the firewall instructions below to shut down unauthorized inbound ports.
UFW Firewall Rules
Allow Command
sudo ufw allow 3306/tcp
Block Command
sudo ufw deny 3306/tcp
iptables Firewall Rules
Allow Command
sudo iptables -A INPUT -p tcp --dport 3306 -s 192.168.1.0/24 -j ACCEPT
Block Command
sudo iptables -A INPUT -p tcp --dport 3306 -j DROP