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Old 01-19-2004, 01:09 PM   #1
Junior Member
Join Date: Jan 2004
Posts: 1
Default flashfxp and firewall

Hi .
I would like some informations ….
2 days ago I installed flashFXP,but I have some problems whit kerio personal firewall.
I know that protocol FTP and its clients(like flashfxp) use only 2 ports 21(out) and 20 (in).
when I connect whit flashfxp, KERIO show an alert message about por 21 out (this is ok)
but then KERIO shows many alert for different many many remote port.. 1235,1424, 1436 4662................(out) bat not(20in)
I DONT LIKE IT (many port is dangerus.......)

Can you help mi to configure (if possibol...) flashfxp to use only 21 out and 20 in ports????

Thanks you


flashFXP by default does it use passive mode or active mode?????


Sorry for my english, Im italian.
gatto is offline  
Old 01-19-2004, 03:58 PM   #2
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FlashFXP Beta Tester
Join Date: Oct 2001
Location: Brooklyn, NY
Posts: 3,881

your information is correct.
ftp server needs to have 2 port ranges open.
1st is control connection port (such as port 21, but can be any 1-65535)
2nd is data connection ports(any port range 1024-65535).

ftp client can function without any open incoming ports by using PASV connections. however to have as little problems as possible it's better to open data connection ports on client as well, also in range 1024-65535. number of ports depends on how many ftp connections/transfers you usually have.

now if your firewall is showing that FlashFXP is using "1235,1424, 1436 4662" then you should throw it away becuase it's giving your wrong information. FlashFXP only uses consecutive port numbers.

if you want more detailed explanation of how ftp protocol works, read http://slacksite.com/other/ftp.html
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alert, flashfxp, kerio, port, ports

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