Microsoft Network Policy Server (NPS) log files are the primary trail for auditing and troubleshooting network access requests. NPS acts as a RADIUS server on Windows Server infrastructure. It logs every connection attempt—whether it is a VPN login, a wireless connection (802.1X), or a hardwired switch port connection. 📂 Storage Location & Naming Conventions
By default, text-based NPS log files are stored on the local machine: Default Directory: C:\Windows\System32\LogFiles</code>
File Prefix: Files start with IN (e.g., IN2606.log for June 2026).
Best Practice: Administrators often change this location to a dedicated data drive. This prevents a sudden flood of authentication traffic from filling up the operating system drive and crashing the server. ⚙️ Available Log Formats
When saving to local text files, NPS offers three formatting structures through the [Microsoft TechNet Management Console](http://technet.microsoft.com/en-us/library/cc731085(v=ws.10):
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