High performance ftp server support multiple virtual servers with algorithm to reduce ftp server CPU and memory consumption. Powerful access control rules. Can hide/show files or directories by wildcards filename defination, username, user IP, time range. Can define user's ftp action permission on files or directories by wildcards filename defination, username, group, IP, time range. Support separated three level virtual pathes for user, group and public. Each user will not see other users' virtual path. Server total bandwidth control and can define scheduled total bandwidth by time period. Can automatically detect WAN IP and its change when ftp server is behind NAT/firewall, which could work on all window operating system and doesn't require router to support UPnP. Can configure ftp commands execution speed of each user for better protection of ftp server from DoS attack. Auto Block IP for anti-hammer or malicious behaviors of user. Easy to setup and run ftp server as system service. Remote admin abilities, start and stop each virtual server from remote. Detailed server and user status. Users download/upload speed limit. Can define maximum connections by IP, username, or group. Seperate welcome message file for each virtual server. Deny or allow user access to ftp server accroding to IP address(support IP and netmask). Can log ftp sessions by IP, time range, username, groupname, user IP address.