The server administrator can delegate and grant administration access to end users in a limited way. You can allow a user to see the user manager or edit users, see the server prefs or edit them, see jobs, or edit them, and so on. You can also make a limited admin who has access to a subset of users and that is all they see and can work with. They are walled off into their own limited administration area.

While CrushFTP is not a traditional AS2 styled server that focuses on B2B operations, it can be used to accept AS2 files and send out MDN responses. You can configure CrushTask to send AS2 outgoing requests as well, or proxy data through CrushFTP as an outgoing AS2 send. CrushFTP is primarily a file transfer server, and treats AS2 transfers as just another way to send a file's contents.

CrushTunnel allows for a robust system of running other connections an a multiplexed HTTP(s) connection. For example you can run an insecure FTP connection inside a HTTPS tunnel to its destination keeping everything secure. If there are any network interruptions, thats fine too as the tunnel ensures the "internal" connections are not interrupted. The tunnel can gracefully recover from lost packets, and disconnections. The tunnel also provides bandwidth acceleration for enterprise licenses so that the single connections gets divided up into many connections delivering the data in parallel to the other side where its reassembled in order and delivered to the real destination it was intended for.

We have native support for a similar feature right in the web browser using WebSockets. Both uploads and downloads can be accelerated, which can significantly reduce transfer times. No special plugins or any software needs to be used, its native to any modern web browser.

Users can inherit settings from the group they belong to (default), or they can be set to inherit an individual setting from any other user or group. Inheritance can be layered so that each higher layer overrides values from the lower layer allowing you to combine inheritance in complex scenarios.

Files that are being uploaded have the ability to be getting unzipped as they are being received, decrypted via PGP, and even encrypted via PGP all before they ever get written to disk. Further, since you can use a many different protocols for the VFS as the back end, you may never even be writing them to a local disk. They might be getting streamed directly to an S3 bucket or Azure location...never even touching the disk on your server.

The built in log viewer handles realtime log viewing of server logs. It handles any sized log file, allows multiple item filtering, and multiple color highliting. This can prove invaluable when searching or debugging a situation. It can also handle other log files on the server unrelated to CrushFTP allowing for additional server monitoring by full administrators.

Browsers that support HTML5 movies can stream compatible formats and move to any point in the file without the need to download the entire movie. The preview is built into the CrushFTP interface and can be utilized in slideshow mode as well.

Pressing the keys 'alt-f' or 'option-f' will open a quick find panel in the user manager. This can be used to quickly find and open a user, or to find a particular setting. Think of it as a global way to search for anything in the user manager.

CrushFTP's web port can be configured as a reverse proxy for a backend server, forwarding the entire domain to that server. This allows CrushFTP to handle the encryption, and block abusive DOS attacks while protecting your internal server.

SFTP - This uses a SSH connection to perform file transfers. Public / private key authentication can be allowed or password-less logins. SFTP is not well suited for high latency connections though. Almost any SFTP client is supported.

SCP - Secure copy also uses SSH, but is meant for pushing a single file transfer as fast as possible. Its not well suited for directories, or for downloading if you don't know the exact file name already. Almost any SCP client is supported.

HTTPS - Complete secure file transfer access entirely from a web browser.

No third party tools needed. See below for more information on the WebInterface.

WebDAV SSL - It uses a HTTPS connection, but communicates using the XML WebDAV interface. OS X and Windows have native support for WebDAV built in

FTPS - Both FTP over SSL Explicit mode (FTPES), and FTP over SSL Implicit mode are supported. Support for Clear Command Channel (CCC), and client auth certificates. MODE Z and other enhanced FTP commands such as support for IPv6 is also supported.

SSH Tunnel - The SSH server in CrushFTP allows for SSH tunneling with limitations on what locations and ports a user can reach.

You can allow users in the WebInterface to share items. This creates unique temporary links that can be automatically emailed out. The user who shared the item can manage the shares and monitor the usage of the items they have shared. Enterprise licenses allow for additional sharing where the user can creates shares between other CrushFTP users. So if a user has access to a folder, they can share that item with another user.

User settings and virtual file system access can all be stored in SQL tables. This allows for multiple CrushFTP servers to share the common user database, and for you to manage these user accounts externally from CrushFTP.

You can build your private key certificate, the certificate request (CSR) you send to your certificate authority, and import the reply back into the server, all from the WebInterface. Its meant to be extremely easy for users to handle the SSL process which can be very confusing.

The WebInterface allows you to specify custom forms for welcoming a user on their first visit to your site (such as acceptance of a legal disclaimer), or for asking for additional information about uploads. This data can be further processed in email notifications, or written to XML files using a CrushTask as an event in the user's setting in the user manager.

This includes SSL WebDAV serving as well. This means you can mount your CrushFTP server directly in the Finder as another drive and work off of it. The finder supports download only for FTP, but supports everything for WebDAV!

You have full control to customize the web interface. You can customize the colors, fonts, logos, etc. Additionally using jQuery, you can further manipulate and customize the WebInterface in infinite possibilities.

Users can upload files and folders using the built in uploader. There is a download basket where users can collect files to download, then download them all at once with one click. It has sorting, searching, and filtering built into it too. You can right click on an item, and share it with someone over email all from the WebInterface. The temp link created will automatically expire too. A slideshow can easily showcase images right from the browser.

The integrated "Advanced Mode" allows for automatic resumes of uploads, and can utilize compressions to further accelerate uploads.

A user can request a folder as a .zip instead of downloading each file individually. Saves bandwidth and time! The folder isn't first created to a .zip file, but its streamed to the user as CrushFTP generates the .ZIP content. No third party applications needed! With the WebInterface the user can select individual, or groups of files to have donwloaded as a single .zip file. They can also right click and go inside of a zip file to download individual items, or multiple items right from inside of a zip. You can also allow them to right click and unzip a file, or zip some items, all handled server side without them needing to download and re-upload the files.