In our setup we use Firewall client to reroute all external traffic via the ISA server. However, if a user tries to download an file from FTP, GFI doesn't scan this file (might contain virus). How do i scan it? (FTP scanning is turned on)
You have to have ftp access redirected via HTTP proxy. I think it works only when used as passive ftp connection and u have to disable all other types of ftp connections . It is described in gfi's faq and in help file as well i believe. There are some limitation but anyway for more advanced users u can create separate rules. If you wouldnt manage let me know.
Ensure that users download files and browse ftp servers using Internet explorer. To enforce this, do not deploy the firewall client to users. Users will need to disable folder view in Internet Explorer in order to view ftp server contents. Deploy the firewall client to those few users who need to use an FTP client. (Note that these uploads and downloads will not be content checked)
2. Disable the FTP access filter - this way FTP clients will not be able to connect to ftp servers, whether they have the firewall client or not. Users will need to disable folder view in Internet Explorer in order to view ftp server contents. The disadvantage of this method is that no one on the network will be able to use an FTP client.
To disable folder view in Internet Explorer
Internet Explorer 5 and higher will automatically be a http proxy server FTP client. However, you will need to make sure that your users do not browse ftp servers using 'folder view'. If folder view is switched on, then browsing FTP sites will fail if you have disabled the FTP access filter. If you disable folder view users will browse and download from ftp servers using http based folder view, and therefore the data can be scanned and quarantined by GFI DownloadSecurity for ISA server.
Important: If you don't disable folder view, users will not be able to browse ftp sites.
IMPORTANT: If you deploy the ISA server firewall client to all users and don't disable the FTP access filter, users will be able to bypass the GFI DownloadSecurity for ISA quarantine system for files!