I have read the FAQ. When I try to configure the FileZilla Server with Windows Firewall, I follow the instructions given in that page. I select the Exceptions tab, click on Add program, browse into C:\Program Files\FileZilla Server\ and double click on fzsftp.exe and then OK. It's the program, FileZilla FTP Cliente, not the executable file, fzsftp.exe, what is added to the exceptions list, and then I check it, and click OK.
But when I run now Filezilla's setting wizard this is its diagnostic:
Thus I do wonder whether it's McAfee's Firewall or the Windows Firewall, or both, the cause for that tainted command, or whether the cause lies with the external router.Connecting to probe.filezilla-project.org
Response: 220 FZ router and firewall tester ready
Response: 331 Give any password.
Response: 230 logged on.
Checking for correct external IP address
IP 188.8.131.52 fi-bhc-cac-cb
Response: 200 OK
Response: 200 Using port 3706, data token 886233492
Response: 502 Port mismatch. Tainted by router or firewall.
PORT command tainted by router or firewall.
Any help much appreciated,