Windows 11’s Controlled Folder Access (part of Defender) blocks unauthorized apps from writing to Documents, Pictures, Desktop, etc. If your TFTP root is inside a protected folder, 3CDaemon will silently fail.
Cause: Windows 11’s DPI scaling for legacy apps.
Fix: Right-click 3CDaemon.exe → Properties → Compatibility → Change high DPI settings → Check Override high DPI scaling behavior → Set to System (not System Enhanced) → OK.
In the world of network engineering, system administration, and embedded systems development, few utilities have achieved the cult status of 3CDaemon. Developed by 3Com, this lightweight, all-in-one tool has been a go-to solution for decades, combining a TFTP server, FTP server, Syslog server, and TFTP client into a single, low-resource package.
However, as operating systems evolve, legacy software often struggles to keep up. With the release of Windows 11, many IT professionals have asked a critical question: Does 3CDaemon work on Windows 11? 3cdaemon windows 11
The short answer is: Yes, but with caveats. This article provides a definitive guide to installing, configuring, and troubleshooting 3CDaemon on Windows 11, ensuring you can continue to use this powerful tool for network device backups, firmware upgrades, and log aggregation.
By default, 3CDaemon runs only when a user logs in. To make it a true background service:
Note: The GUI may not appear; you manage via config files. For most, manual start is easier. Windows 11’s Controlled Folder Access (part of Defender)
If you cannot get 3CDaemon stable, consider these modern (or updated) alternatives:
| Tool | TFTP | FTP | Syslog | Notes | |------|------|-----|--------|-------| | SolarWinds TFTP Server | Yes | No | No | Free, actively maintained, runs perfectly on Windows 11 | | TFTPD32 / TFTPD64 | Yes | Yes | Yes | Open-source, lightweight, excellent Windows 11 support | | Kiwi Syslog Server | No | No | Yes | Free version limited to 100 messages/sec | | FileZilla Server | No | Yes | No | Great FTP, but no TFTP/syslog | | OpenTFTP | Yes | No | No | Minimalist, works well |
However, for a single tool that bundles all three services, 3CDaemon remains unique—when it works. By default, 3CDaemon runs only when a user logs in
3CDaemon is not natively a service. To have it start automatically without a user login:
Be aware: Syslog output to GUI requires interactive desktop; for headless operation, log to files instead.
Use a tool like Kiwi Syslog Generator or configure a router with:
logging host [Windows11-IP]
You’ll see messages appear in real-time.