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# Enable Passive Mode on FTP Server
{% hint style="info" %}
DeviceOn FTP default setting is active mode. However, FTP runs active mode may fail in cases where the server is behind a router or the server deplyed on Azure/AWS or other cloud’s virtual machine. And that will cause DeviceOn initialize failure. To solve this issue, you should change FTP server to passive mode.
{% endhint %}
## **Step 1**: Edit Configuration File
Open the **ftpd-typical.xml** on text editor tool that located in
```
\DeviceOn Path\ftp\res\conf\
```
Add the following XML attribute (data-connection) into listeners tag and give your **passive ports** range and **external DNS**.
```
```
“**60001-60100**” means in passive mode, ftp client uses port 60001 to 60100 to transfer data. You could change it to any available ports range. “**YOUR\_EXTERNAL\_DNS**” means in passive mode, client’s destination domain name. You should replace it with real domain name which can be access from external side. After that, restart the service (**Apache FtpServer ftpd**) to apply setting.
## Step 2: Add inbound security rules
Add inbound security rules on your **network security group (ex, ****Azure Network Security Groups and Firewall Rules****)**, make sure blow ports are available.
* **2121** (command port)
* **60001-60100** (Passive port)
## Step 3: Restart Service
Restart DeviceOn service, stop/start the “**Management Service**” via server tray icon.
---
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