FTP from a ASP.NET application on IIS7 Fails

Question

I have a problem that only occur when I run my application from the IIS.

I am trying to FTP from my ASP.NET application to an external site.

I can FTP from the server in general but not from my application. My request times out.

The owner of my Website is now set to the IIS_IUSRS user with Full control.

Do anyone have ANY idea what might keeps me from succeeding?

Any help will be extremely appriciated.

My Deadline is within 12 hours and I am royaly screwed...

Answer 1

Same problem solve UsePassive . Maybe you can add allow port 20,21 for FTP on firewall (For me not necessery).

FtpWebRequest reqFTP;
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(@"ftp://ftp.example.com/"));
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential("user", "password");
reqFTP.Proxy = null;
reqFTP.KeepAlive = false;
reqFTP.UsePassive = true;

Answer 2

A quick fix may be setting the anonymous user that IIS uses to your user account instead of the IUSR account (in IIS). It does seem to be a permission problem.

Second bet would be to use a tool like Wiresharck/Etherreal and check if any connection to the FTP site is made, and debug from there.

Answer 3

I Found the Solution

Windows Firewall and non-secure FTP traffic

Windows firewall can be configured from command line using netsh command. 2 simple steps are required to setup Windows Firewall to allow non-secure FTP traffic

1) Open port 21 on the firewall

netsh advfirewall firewall add rule name="FTP (no SSL)" action=allow protocol=TCP dir=in localport=21

2) Activate firewall application filter for FTP (aka Stateful FTP) that will dynamically open ports for data connections

netsh advfirewall set global StatefulFtp enable

I don't really know what that just did but it did the trick