FTP Failed to retrieve directory listing

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Some times we will get the error ” Failed to retrieve directory listing ” while trying to connect FTP .

Most of the time its because of the missing ftp kernel module ” ip_conntrack_ftp ”

1) Check if the ftp kernel module is exists

lsmod | grep ftp

2) Add the module

modprobe ip_conntrack_ftp

3 ) Restart ftp server

This will fix your issue !!