Vsftp passive mode configuration

Question

Hi,  
I'm trying to configure a vsftp server on one of my ec2 instances but when I try to connect via a ftp client in passive mode I receive the error message "**Server sent passive reply with unroutable address. Passive mode failed.**"  
  
I have added to my vsftpd.conf file the following lines

```
pasv_enable=YES
pasv_min_port=1024
pasv_max_port=1048
port_enable=YES
pasv_address=xxx.xxx.xxx.xxx
```

and I have configured the ports 20,21 and 1024-1048 in my security group.  
What am I missing?

cb1976 · Answer

I find the solution to the problem...  
If the instance has and ipv6 address associated vsftpd will always return 0.0.0.0 as remote address.  
  
You can avoid this behaviour setting this parameters:

```
listen=YES
listen_ipv6=NO
```

Vsftp passive mode configuration

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