Windows 11’s firewall is aggressive. 3CDaemon uses the following ports:
Note: Running as an administrator ensures the application can bind to low-numbered network ports (like Port 69 for TFTP) and write configuration data to the system registry. Configuring the Windows 11 Defender Firewall
: Ensure the app is running as an administrator. Move the 3CDaemon folder entirely out of the system drive root or user profiles into a directory with open write permissions, such as C:\Tools\3CDaemon\ . Files Fail to Transfer (Timeout) 3cdaemon windows 11
Security assessment
To avoid immediate runtime crashes, avoid using standard installation paths. Follow this specific deployment method: 1. Choose a Non-Protected Installation Path Windows 11’s firewall is aggressive
For larger file transfers that require basic user authentication: Click on -> Configure FTP Server .
Before diving into Windows 11 specifics, let’s recap why 3CDaemon remains relevant even in the era of cloud computing. Move the 3CDaemon folder entirely out of the
Windows 11's security is much tighter than the OS 3CDaemon was built for. You must manually allow the application through the Windows Defender Firewall : Allow UDP Port 69. FTP: Allow TCP Port 21. Syslog: Allow UDP Port 514. 3. Address the "Directory Change" Bug