This kind of problem is often encountered by webmasters. I will share with you the real solution!
Problem: 2003 Server is used to provide web and FTP services, and uses flashfxp on the Internet to remotely upload webpages. If the firewall is disabled, FTP uploading and downloading will be normal, but it will not work after Windows Firewall is enabled, even if services such as web and FTP are listed as exceptions. The reason is that when flashfxp is working, more than 1024 of the TCP port is used, and the port setting needs to be changed. If you have similar experience, how can I ensure that flashfxp can be uploaded and downloaded normally when Windows Firewall is enabled? You only need to know That FTP uses ports 20 and 21.
Solution:
1. Enable Windows Firewall;
2. In the "exceptions" set by the firewall, set the IIS CoreProgramC: \ windows \ system32 \ inetsrv \ inetinfo.exe;
3. In "advanced-local connection-setting" of firewall settings, deselect FTP check.
Success.