[FW1] Strange FTP behaviour

["Maertens Jochen (JMRT)" <jochen.maertens@FW1-NOSPAMagoria.be>]

> We have a problem on our firewalls concerning FTP.
> When transferring a certain amount of files through the firewall onto or
> from the DMZ the transfer suddenly stop because the firewall blocks
> eventhough the source-port is ftp-data.
> On the ftp server we see that port 8169 is being used instead of port 20
> for the transfer of that specific file where the transfer stops. all other
> transfers are made on the ftp-data port 20. This happens with microsoft
> IIS FTP on NT4 and ipswitch FTP server on NT4
> Any ideas would be welcome.
> 
> Jochen



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