{"id":2534,"date":"2021-05-13T02:27:26","date_gmt":"2021-05-13T02:27:26","guid":{"rendered":"https:\/\/auladig.co\/?p=2534"},"modified":"2025-12-20T15:31:01","modified_gmt":"2025-12-20T15:31:01","slug":"como-configurar-tu-servidor-ftp-detras-de-un-servidor-nat-con-ip-dinamica","status":"publish","type":"post","link":"https:\/\/agenciaroco.com\/en\/how-to-configure-your-ftp-server-behind-a-nat-server-with-dynamic-ip\/","title":{"rendered":"How to Configure Your FTP Server Behind a NAT Server with Dynamic IP"},"content":{"rendered":"

Knowing how to configure your FTP server behind a NAT server with a dynamic IP address is a common challenge for those who need their server accessible from the outside, but are faced with changing IP addresses and routers with NAT.<\/p>\n\n\n\n

In this article, you'll learn how to set up an FTP server with FileZilla Server, enable passive mode, port forwarding, assign a static IP address, and use DDNS to maintain a stable connection from any location.<\/p>\n\n\n\n

Why is it difficult to set up an FTP server behind a NAT with a dynamic IP?<\/h2>\n\n\n\n

One of the main challenges when setting up an FTP server at home or on a corporate network is that we're often behind a NAT router with a dynamic IP address. This complicates external connections, as all devices share a single public IP address, preventing the client from connecting directly to the server.<\/p>\n\n\n\n

FTP (File Transfer Protocol) allows files to be transferred between a client and a server. However, since the server is located on a local network, external connections must be properly redirected to reach the correct computer, which requires configuring both the router and the FTP server software.<\/p>\n\n\n\n

To understand how this connection works, we must know that the client needs to know the FTP server's IP address. Since this address can change constantly (because it's dynamic) and doesn't point directly to our device, we must rely on specific configurations such as passive mode and port forwarding.<\/p>\n\n\n\n

Next, we'll show you how to use FileZilla Server to set up your FTP server and prepare your network so external connections work properly even with a dynamic IP address.
Initial FTP Server Configuration with FileZil<\/p>\n\n\n\n

FTP Server Setup with FileZilla Step by Step<\/h2>\n\n\n\n

Installing Filezilla Server<\/h3>\n\n\n\n

On our computer we are going to configure the FTP server, for this we use filezilla server. On the Internet you will find more options such as Titan FTP Server, Serv-U FTP Server, among others, but Filezilla is the one that has taken its strongest place. <\/p>\n\n\n\n

First we install it in the folder we define, leave the default options and enter an administrator password. Once installed you will find a screen like the following:<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

<\/p>\n\n\n\n

Once FileZilla Server is installed, we access the administration interface with the following settings:<\/p>\n\n\n\n

    \n
  • Host:<\/strong> localhost<\/code> (to connect to the same computer \u2013 127.0.0.1)<\/li>\n\n\n\n
  • Port:<\/strong> 14147<\/code> (default port of the administrative panel)<\/li>\n\n\n\n
  • Password:<\/strong> the one established during installation<\/li>\n<\/ul>\n\n\n\n

    <\/p>\n\n\n\n

    Upon entering, you may see some warnings. The most common are:<\/p>\n\n\n\n

      \n
    • \u201cYou appear to be behind a NAT router. Please configure the passive mode settings and forward a range of ports in your router.\u201d<\/li>\n\n\n\n
    • \u201cFTP over TLS is not enabled, users cannot securely log in.\u201d<\/li>\n<\/ul>\n\n\n\n

      <\/p>\n\n\n\n

      The first warning is the one we'll address in this article, as it prevents an external client from connecting properly. This situation is common when configuring your FTP server behind a NAT server with a dynamic IP address. We'll address the second warning, related to the lack of FTPS encryption, later.<\/p>\n\n\n\n\n\n \n