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Win2003 IIS FTP woes with Windows Firewall

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Junior Guru Wannabe
Join Date: Aug 2002
Location: Lakeland, Florida
Posts: 99

Win2003 IIS FTP woes with Windows Firewall

I just set up my first Windows 2003 IIS 6 server and after a bumpy start (I've only ever managed a Linux server) I had just about everything set up. Trouble is, I've been having a heck of a time uploading files to the server via FTP. For some reason, files over 1mb will sometimes toss back an error -132 once the progress hit 99%. Oddly the file transfer actually completes despite the fact that the client receives the error.

Messing around with the built-in Windows firewall settings didn't help much nor did changing clients. The only thing that worked was turning off the firewall completely. Figuring the problem was likely a flakey IIS FTP, I downloaded a 30 day demo of Gene6 FTP and tried that since it integrates with Plesk.

Installation was a breeze and I had everything running in minutes, it even ported all my accounts over (since it uses the Windows accounts by default). Trouble is it didn't fix my problem, in fact now it's worse. With Windows Firewall enabled *no* upstream transfers over 1mb will complete using Gene6 compared to the sporadic behavior of IIS. I've added exceptions for ports 21 and 20 and added in a range of passive ports but it didn't help. I even added the g6ftpserver.exe app to my exceptions list but that didn't help either. As with the built in FTP server, turning off Windows Firewall on the server is the only thing that solves all my problems.

A quick google of the issue turned up this thread but there was no answer there either (outside of disabling my firewall):

I'm stumped. Can anyone offer some advice? Maybe I need a better firewall? Can anyone recommend a decent affordable one?

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Join Date: Jan 2006
Posts: 6
How did you allow FTP transfers?

By adding port 21 to the firewall excludes or by going to the last tab in the firewall config and enabling the FTP feature?

Just unblocking Port 21 gives all sorts of problems while the other has been working perfectly for us. Just yesterday someone uploaded a 2GB database dump without problems.

WHT Addict
Join Date: Mar 2004
Posts: 125
You actually don't need to buy a firewall for Windows 2003. There's a MMC that you can install called "Routing and Remote Access". RRaS is a much more advanced firewall then Windows Firewall and it can do more then just act as a firewall as well.

I recommend you look into RRaS.


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