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Barracuda SSL VPN

What is the Barracuda SSL VPN?

  • Type: Knowledgebase
  • Date changed: 2 years ago
Solution #00003708

This solution applies to Barracuda SSL VPNs, all firmware versions.


The Barracuda SSL VPN is a browser-based SSL VPN solution. This remote access solution provides users and businesses alike with a means of securely accessing network resources from outside the network perimeter using only a standard web browser. These resources can be files, intranet sites, and internal computer systems. Access to these resources is governed by SSL VPN?s security model, meaning that users may be restricted to access only those services to which the administrator grants access.

This technology is ideal for anyone who requires remote access to the corporate network such as road warriors, systems administrators, teleworkers etc. The Barracuda SSL VPN is particularly suited to administrators as a range of administrative applications, such as SSH1/2, SFTP, RDesktop, TN5250/AS/400, Telnet, VNC, Citrix, and Windows Terminal Services have been made available.

The Barracuda SSL VPN focuses on bringing enterprise level features to individuals and smaller organizations, along with a range of value-added services and software for those groups that require advanced features.


Additional Notes:

The term "SSL VPN" is used to refer to a new and fast-growing product category comprised of a variety of technologies. To broadly define what products and technologies are within this category, one can begin with the term VPN itself. VPN, or Virtual Private Network, refers to the practice of using a public network like the Internet to transmit private data. These systems use encryption and other security mechanisms to ensure that only authorized users can access the network, and that the data cannot be intercepted.

SSL VPNs use SSL/HTTPS (Secure Sockets Layer), a protocol developed by Netscape for transmitting private documents via the Internet. SSL is a cryptographic system that uses two keys to encrypt data ? a public key known to everyone and a private or secret key known only to the recipient of the message.


SSL is available, without additional software deployment, on all standard web browsers as a secure transport mechanism; SSL has become a ubiquitous method of encrypting connections to web sites. By convention URLs that require an SSL connection start with "https://" instead of "http://."


The Barracuda SSL VPN encrypts connections between the mobile user and the internal resource via the web browser at the application layer. Traditional VPN technologies, such as IPSec VPNs, encrypt data at the network layer.

The use of the Barracuda SSL VPN is ideal for the mobile user because:

  • SSL does not need to be downloaded onto the device being used to access corporate resources.
  • SSL does not need to be configured by the end user.
  • SSL is available wherever there is a standard Web browser, so users do not require a company laptop.
  • SSL port 443 is usually open on a corporate firewall, requiring no additional configuration.
Because SSL VPNs operate at the application-layer, it is possible to offer extremely granular access controls-to applications, making it ideal for mobile workers and those users coming from an insecure end-point who need access only to specific internal resources.

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