Editions

Enterprise Edition
The enterprise edition is primarily for administrators who run sites on multiple computers and have users in an NTLM or Active Directories they would like to provide FTP access to. The distinguishing feature of the Enterprise Edition is the ability to authenticate against a remote Active Directory or remote computer on the same domain as the FTP server is running without importing users. The FTP server service can also impersonate an NT user restricting it to any restrictions placed on it by the Administrator in the NTLM or Active Directory  
Professional Edition
The professional edition has all the features enabled in the FTP Server. It supports unlimited users but is restricted to 100 concurrent connections. It also cannot authenticate NT users against a remote machine or remote Active Directory server. This edition is ideal for most administrators who run isolated FTP server machines  

Licenses

Workstation License
A workstation license is a license that restricts the FTP server to run on only one computer/workstation. The License you generate will be restricted to the name of the computer the server will be operating on. You will be allowed a limited number of renames in a month using the license manager  
Domain License
A domain license is like a site license but is for adminstrators who would like to run the FTP server on multiple computers within a domain. The domain license will only work on a computer in a domain. Do not purchase this license if you plan on using the FTP server on a computer that is not part of the domain. With the domain license you can run multiple instances of the server on multiple computers as long as they are in the same domain  

Feature Chart

Feature Free Professional Enterprise
User Accounts
10
Unlimited
Unlimited
Simultaneous Connections
10
100
Unlimited
Active Directory Authentication
Local Only
Local and Remote
Integrated NT user accounts authentication (without importing)
Local Authentication
Local & Remote Authentication
NT User Security Impersonation
Secure Socket Layer3 (SSL & TLS)
Anti-hammer & Auto-ban support
Restrict users based on domain or ip addresses
Bandwidth caps (server or individual account)
Ratios and Quotas (session quota or disk quota)
Remote admin support (live statistics and spy on users from remote machines)
Customize server name, site closed message, connect message
Set server execution priority
User account expiration
Import NT user accounts from local or remote machines
Create NT user accounts from FTP accounts
Runs as NT Service
Automatic Date and Time Activation
Set Default Folder Permissions
Configure for firewall/router/nat operations
Listen on all or specific ip addresses
Unlimited scripts execution. vbscript, perlscript, jscript and pythonscript
Realtime server statistics (GUI and external activex control)
3D Graphical Server History
Root, virtual and merge folder support
Anti-idle, owner-create, custom user listen port, login message support
site commands, account comments, file blocking, account history

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Edition: 
License: 

Enterprise Edition

License Price (USD)
Workstation
69.99$
Domain
199.99$

Professional Edition

License Price (USD)
Workstation
39.99$
Domain
119.99$


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