Does it crash on startup, when a user logs in, or later while there's activity?
You also start from a default ioFTPD installation (including an empty site root). Then make the changes one by one until you found the cause for the crash.[list=1][*]Edit the ioFTPD.ini and Hosts.Rules.[*]Test if your setup works.[*]Copy /users, /groups, and /etc over.[*]Test again.[*]Finally, try changing back to your original site root.[*]And test again.[/list=1]Test after each change you make, do some troubleshooting.