Here is your first Forum » Firewalls vs. Port Checks: Why You Need Both

Introduction
Firewalls filter traffic, but port checks reveal what’s already exposed. Here’s how they work together.

Firewall Limitations

Can’t detect misconfigured rules (e.g., allowing Port 23).

May miss malware listening on odd ports (e.g., 4444).

How Port Checks Help

Identify unauthorized openings (e.g., a new SQL server on Port 1433).

Audit ISP-level blocks (e.g., Port 25 for email servers).

Tool Suggestion:
Pair firewall logs with theportchecker.com scans for full visibility.

Case Study: A company’s firewall allowed Port 7547 (TR-069), exploited in the Mirai botnet.