WCF Service hosting on IIS to connect FTP Server.

Question

Hi,

 

I have a WCF Service which connect to FTP opens directory and download the files from FTP Server and save into server. 

When I run this  service from asp.net development server it works fine without any error. But when I host this service on IIS and trying to call the service following error thrown by IIS.

425 Can't open data connection.

Can you please tell me why this is happening.

 

Thanks.