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ftp'ing from behind ipchains

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I''m looking for some help on an ftp problem I''m having that only occurs from machines behind my firewall. I''m using ipchains as a firewall/router and I frequently connect to ftp sites which host huge files. My problem is that I queue up several files to download, and the first file will usually arrive intact after two to four hours, but none of the other files will download. My ftp client doesn''t give me any messages at all, it just sits there as though it''s still downloading. I do not have the same problem when downloading smaller files or when ftping from the machine running ipchains (which is not set to route through ipchains). I''m not network savvy, so I apologize if this explanation is somewhat off, but my network guy at work says that ftp clients running in passive mode (which I have to use) still need to periodically send a "keep alive" message to the server, even though I still have a connection through the download. Why would ipchains be blocking this, and how can I get it to allow the "keep alive" message through?

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