FTP is a very insecure protocol because all passwords and all data are transferred in clear text. By using TLS, the whole communication can be encrypted, thus making FTP much more secure. This article explains how to set up ProFTPd with TLS on a Debian Etch server.

I do not issue any guarantee that this will work for you!

1 Preliminary Note
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One of the first rules in security is to keep your servers always updated to the latest security patches. Debian provides a wonderful and very easy mechanism to do this. There have been many questions if it is best to update automatically or manually.
Here are my 2 cents on this issue:
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