Network Security Port Scanning: Inspecting HTTP, SSH, and Database Ports Safely
Published 2026-08-07 | Author: Sarah Connor | Category: dev-experience
Learn how network administrators scan open server ports, detect exposed database instances, and configure firewall rules.
## Understanding Server Network Ports In TCP/IP networking, a **Port** is a logical communication endpoint assigned to specific network services and applications running on a server host. Scanning open ports allows security engineers to audit exposed attack vectors and verify firewall rule enforcement. --- ## 1. Critical Well-Known Ports Reference | Port Number | Service Protocol | Risk Profile if Unintentionally Exposed | | :--- | :--- | :--- | | **21** | FTP (File Transfer Protocol) | Unencrypted credential transmission | | **22** | SSH (Secure Shell) | Remote command line access | | **80 / 443** | HTTP / HTTPS | Web traffic (Standard open ports) | | **3306** | MySQL Database | Unauthorized database access | | **5432** | PostgreSQL Database | Remote SQL injection targets | --- ## 2. Securing Server Endpoints Always restrict sensitive database ports (3306, 5432) to internal VPC networks or local host bindings (`127.0.0.1`), utilizing our **Online Port Scanner** to confirm external firewall blocking.Recommended Developer Tools
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