Hi There!

I installed my system like you explain in your documentation and this is my system.

• Ubuntu 16.04
• Using SSL through LetsEncrypt module
• ProFTPD module Main
• Main Domain is a WordPress

I know there're a lot subjects for this issue and I read dozens of documentations but unfortunately nothing of those solutions working with me, I installed virtualmin correctly (I think) I'll write the commands that I run to make sure it's ok setup

Install Commands

1. sudo apt-get update
2. sudo apt-get dist-upgrade -y
3. This message A new version of /boot/grub/menu.lst is available but the version installed currently has been locally modified appeared ONCE during setup and I chose Install the package maintainer's version
4. Reboot the system
5. wget https://software.virtualmin.com/gpl/scripts/install.sh -O /root/virtualmin-install.sh

Then I create the first virtual server for my main domain and sub domains and request LetsEncrypt certificates and all working very well.

My Issue with FTP, WordPress and FileZilla

1- I tried to login in FileZilla with Host: ftp@DOMAIN_NAME.com but I received the following messages...

    Status: Initializing TLS...
    Status: Verifying certificate...
    Status: TLS connection established.
    Status: Logged in
    Status: Retrieving directory listing...
    Status: Server sent passive reply with unroutable address. Using server address instead.
    Command:    MLSD
    Error:  Connection timed out after 20 seconds of inactivity
    Error:  Failed to retrieve directory listing

2- In my main domain I cannot add new plugin or media file and FTP credentials box appear too (I think it's related).

My solutions after some search

1- I made some searches and I see this command {modprobe ipconntrackftp} in {https://www.virtualmin.com/documentation/web/faq#toc-ftp-service-isnt-working-Llnjz8K8} so I make the following steps Then I Reboot the system.

• sudo modprobe ipconntrackftp
• Add the line {ipconntrackftp} to {/etc/modules}
• sudo reboot

2- I made some changes to {/etc/proftpd/proftpd.conf} Then Restart the ProFTPD service .. These are my new settings

UseIPv6                          off
ServerName                   "mydomain.com"
DefaultRoot                    ~
RequiredValidShell        on
AuthOrder                      mod_auth_pam.c* mod_auth_unix.c

3- I read about IP Tables but I don't know Is that what I need?

-- The Result .. Nothing Changed the same message appear in FileZilla and I cannot add or upload plugin and media in my WordPress website.

Thanks for your help.