IIS FTP through port forwarding, passive mode problem

Are you trying to test FTP from a local computer? It won't work. Go to http://www.g6ftpserver.com/en/ftptest to test your FTP server.

Grumpy

Nope I'm testing from a remote PC using the internet IP for my router.

I can make an ftp connection to port 21 fine, it just fails when setting up the data connection

The FTP test returned

* About to connect() to x.x.x.x port 21
* Trying x.x.x.x ... connected
* Connected to x.x.x.x (x.x.x.x ) port 21
< 220 Microsoft FTP Service

> USER guest
< 331 Password required for guest.

> PASS *****
< 230 User guest logged in.

> PWD
< 257 "/guest" is current directory.
* Entry path is '/guest'

> CLNT Testing from http://www.g6ftpserver.com/ftptest from IP 217.154.32.194
< 500 'CLNT Testing from http://www.g6ftpserver.com/ftptest from IP 217.154.32.194': command not understood
* QUOT command failed with 500
* Connection #0 to host x.x.x.x left intact

* Closing connection #0

which doesn't look particularly helpful

Passive mode also requires and additional ports. Did you forward those as well?

http://support.microsoft.com/?id=555022

Grumpy

All ports are being forwarded (1 to 65535)

One thing I noticed is the ftp program is sending "227 Entering Passive Mode (192,168,0,10,18,106)". which is the LAN address rather then the external address.

Do FTP clients use this IP or will they go with the original host name given?

Can't answer your question. I've never setup a FTP server using IIS.

Grumpy

when you run your FTP server in passive mode, the server needs to send the client a response with the external IP address i think. If the FTP server sends the internal IP as the response then things wont work. this is usually configurable on the server. if you can't figure it out with IIS, then I dont blame you. Try using FileZilla FTP Server because its easier to understand I think and that configuration parameter is easy to find.

Setting up FTP servers can be a royal pain. I have setup several FTP server, both NAS boxes. One worked with out a hitch, the other was browser sensitive. I had one that only worked with IE passing the user & pw on the address bar. The problem accours when there are firewalls on both ends.

Here is a link that will help explain how the hand shaking works.

http://slacksite.com/other/ftp.html

Good luck.

The cost of running your own FTP server is very high: you need an always-on FTP server computer, then you need to install FTP server software. For this to be reliable, you need to take care of the security, which means you need to configure access permissions carefully and install OS patches periodically. Moreover, you need to backup the server and make sure you have redundant hardware. Then you need to have a good and reliable Internet connection.

The cost can be thousands of dollars, not including your time and efforts!

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Jacky
www.DriveHQ.com