Portmon was last updated in 2006. Because it relies on a legacy 32-bit driver to intercept port traffic, it does not function natively on 64-bit versions of Windows. Since Windows 11 is exclusively 64-bit, the original Portmon.exe will typically fail to start or fail to capture any data. Why it fails:
Portmon is a free, open-source network monitoring tool that allows users to capture, analyze, and visualize network traffic on their Windows system. Developed by McAfee, Portmon is designed to provide a detailed view of network activity, enabling users to detect potential security threats, troubleshoot network issues, and optimize system performance. portmon windows 11
Windows 11 is strictly a 64-bit operating system. The original Portmon was a 32-bit application bundled with a 32-bit kernel driver. Even in compatibility mode, a 32-bit driver cannot interact with a 64-bit OS kernel. This architectural mismatch is insurmountable without a complete rewrite. Portmon was last updated in 2006
If you absolutely must use the original Portmon tool, you cannot do it directly on the Windows 11 host. You have two primary options: 1. Compatibility Mode (Limited Success) Why it fails: Portmon is a free, open-source
This is the closest free, working alternative to classic Portmon for Windows 11.
Windows 11 is blocking the driver because it is not signed or you lack admin rights. Fix: