Hello! 8)
I’m trying to solve this problem for a few days now and I’m starting to be completely desperate. 
I can’t get any FTP client (e.g. FileZilla, TotalCommander) to work! When I try to connect with FileZilla, “150 Opening ASCII mode data connection for /bin/ls.” appears in the status window and that’s it. Only the error messages “Disconnected from server: ECONNABORTED - Connection aborted” and “Failed to retrieve directory listing” shows up.
I read some posts here in the archive, but the suggestions didn’t work. FileZilla IS set as a trusted application, I set the rules to “Allow All Requests”, add the FTP pasive rule to Global rules, allowed everything in the Predefined Firewall Policies, I even deleted “Block and Log All Unmatching Requests”, but nothing helped. As soon as I set the Firewall security level to “Disabled”, FTP clients work.
I’ve got WinXP SP2, Comodo Firewall ver. 3.5.57173.439
Any help will be appreciated.