We always use IIS' FTP service but recently we have had a few problems with it; what FTP service do you recomend for IIS?

We use Windows Server and Windows XP in the clients.

A free version is a must, We are now considering FileZilla and WarFtp, We will be having 100 concurrent connections.

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do you prefer a single port SFTP (port 22) or a dual port FTP(21+20)/FTPS(990+989) solution? – djangofan Oct 20 '09 at 20:48
single port is fine, but dual port is better – Jedi Master Spooky Oct 20 '09 at 21:49
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7 Answers

up vote 25 down vote accepted

Filezilla; it's free, easy to set up and manage but very powerful. Ability to use non directory users is a big plus.

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+1: It's free and extremely stable. – Jon Tackabury Apr 30 '09 at 12:47
I would second this. And it is free – Xetius Apr 30 '09 at 12:48
It's also quite easy to integrate Filezilla's users with LDAP or active directory, because the config is a very easy-to-parse XML file. – Portman Apr 30 '09 at 18:01
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My company makes a high quality file server with access points for FTP/FTPS/SFTP/WebDav/HTTP/HTTPS.

The product name is Null FTP Server and there is a free version available.

Some of the features:

  • REST HTTP API to control the server
  • Remote administration for 1 or more servers.
  • x86 and x64 variants are available.
  • User authentication is supported with windows user accounts, active directory, and/or built-in accounts.
  • You can either lock a user account into a directory or use the server's root directory.
  • Virtual directories are also supported.
  • several other key features and screenshots
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I have to say, that I was skeptical at first and I tried your FTP server and its great. Great job with that. The config screen for SSL access is especially nice... great job making it easy to understand. ;-) – djangofan Oct 20 '09 at 20:46
Glad you think so, thanks :) – Brian R. Bondy Oct 28 '09 at 15:53
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IIS7 has a completely new FTP component (separate download!) which is a big step up - try to upgrade to Server 2008 and use it if possible ;)

A few of the "features" are ftp over ssl, better user isolation, utf8 and ipv6, support for virtual hosts (think web host header separation)...

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+1 for 2008 FTP service, used it & its great – Nick Kavadias Oct 21 '09 at 5:41
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We just deployed Gene6 FTP Server onto our shared platform. It performs pretty well (1200-1300 sites per server), it's not expensive, and it has a COM API so you can script pretty much all of the configuration without too much fuss.

Edit:

When OP originally asked this question 'A free version is a must' was not specified at the time I answered.

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Why the downvote? – Kev May 26 '09 at 14:52
I didn't give you the downvote but im surprised you got a vote at all with a ftp server suggestion that costs money... – djangofan Oct 21 '09 at 0:10
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When OP originally asked the question he/she didn't specify that it should be free. – Kev Oct 21 '09 at 5:07
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The two biggies are Filezilla (free) and Serv-U. I've had really good luck with both of them. Serv-U has gotten progressively more expensive over the years. I seem to remember it being really cheap at some point.

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I used Serv-U for years and was curious on the price. I do believe it has gone up some but I don't remember what I've paid for it in the past. – Chris Porter May 5 '09 at 3:03
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WarFTP? Please: http://www.warftp.org/

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A collage of mine recommend WarFTP? Any info about this?

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Haven't used it in a LONG while, but if I recall there were security issues. – Jay Stevens May 1 '09 at 16:25
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