Import Log file Error

Hello,
I'm attempting to import a log file from my syslog server to the server running Firewall Analyzer and i had a couple of questions.

1) What happens if during the import, the Analyzer tool encounters the same file; meaning the same data. Is there a chance the Analyzer tool will import the same data twice?

3) Currently i have an FTP server running on the Syslog server. When i click on list files/directories on the Analyzer server i receive the following error:

javax.servlet.ServletException: Command PASV not implemented

When i look at the FTP logs on my Syslog server, i see the server receives the PASV command but nothing after that. Could this be a problem with my FTP server or is there something else amiss on the Analyzer server?

thanks
Sky