Version 1.4.8 of Viscosity for both Mac and Windows is now available! This version addresses the recent OpenSSL "Heartbleed" security vulnerability, and all users are strongly advised to update to this release as soon as possible.

The OpenSSL "Heartbleed" bug is a very serious vulnerability in versions 1.0.1 to 1.0.1f of OpenSSL. OpenSSL is OpenVPN's default library for providing encryption services and hence OpenVPN users are exposed to this flaw. While it is more difficult for an attacker to target an OpenVPN client than a server, it could still potentially allow an attacker to obtain session keys and decrypted data and so it should be treated seriously. Version 1.0.1g of OpenSSL fixes this flaw and this is the version included with Viscosity 1.4.8.

For more information regarding the OpenSSL "Heartbleed" bug please visit The Heartbleed Bug website. For further information on how this bug can affect OpenVPN users please visit the OpenVPN Community Wiki Page.

Version 1.4.8 Mac Release Notes:

Version 1.4.8 Windows Release Notes:

The 1.4.8 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit our support section.

We're pleased to announce that version 1.4.7 of Viscosity for both Mac and Windows is now available! We've vastly improved retina display support for Mac users, and high-DPI interface support for Windows users. We've also created some sleek new toolbar icons for Viscosity's Preferences window that make Viscosity look even better on both standard and retina level displays.

Version 1.4.7 Mac Release Notes:

Version 1.4.7 Windows Release Notes:

The 1.4.7 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit our support section.

Version 1.4.6 of Viscosity for Mac is now available! This update includes some small final tweaks in preparation for the release of Mac OS 10.9 (Mavericks). It has been extensively tested under Mavericks to ensure the best possible experience for users updating their Mac. While previous releases of Viscosity will still run under Mavericks, we encourage all users to update to this version.

Version 1.4.6 Mac Release Notes:

The 1.4.6 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit our support section.

Version 1.4.6 of Viscosity for Windows has just been released! Like the recent Mac update we've greatly improved PKCS#11 support, with it much more straightforward to use for end users. We've also improved two-factor authentication support and made a number of small fixes and enhancements.

Version 1.4.6 Windows Release Notes:

The 1.4.6 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit our support section.

Version 1.4.5 of Viscosity for Mac is now available! We've greatly improved PKCS#11 support, making it more straightforward to use for end users. We've also vastly improved challenge/response support, making it much easier to implement two-factor authentication in custom OpenVPN environments (check out the forum for some examples).

Version 1.4.5 Mac Release Notes:

The 1.4.5 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit our support section.

Version 1.4.4 of Viscosity for Windows is now available. We've focused on increasing the reliability of connections even further, with lots of small improvements and bug fixes. In addition we've added a number of features for enterprise environments, including improved two-factor authentication support and the ability to set machine wide settings and connection permissions.

Version 1.4.4 Windows Release Notes:

The 1.4.4 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit our support section.

Version 1.4.3 of Viscosity for Mac is now available. We've worked hard to resolve all known bugs with this release, improve IPv6 support, upgrade OpenVPN to the latest 2.3 release, and for those Retina MacBook Pro users: menu icons have been upgraded with retina level graphics!

Version 1.4.3 Mac Release Notes:

The 1.4.3 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit our support section.

Version 1.3.1 of Viscosity for Windows is now available!

1.3.1 includes a performance overhaul of Viscosity's background service. We've placed a focus on reducing memory usage by completely rewriting sections that were sluggish or relied on libraries that required large amounts memory. It now has up to 90% less memory and CPU usage, and should resolve any service start up issues.

Version 1.3.1 Mac Release Notes:

The 1.3.1 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit https://www.sparklabs.com/support.

Version 1.3 of Viscosity is now available for Mac users! It is our biggest update yet, with heaps of new features and performance enhancements!

Version 1.3 Mac Release Notes:

The 1.3 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit https://www.sparklabs.com/support.

We’re very pleased to announce that Viscosity for Windows is now available!

We’ve been working hard over the past 12 months to bring over all the power, ease of use, and design aesthetics of Viscosity for Mac to the Windows platform, and we believe Windows users will be impressed with the results. Windows users now have access to the same powerful and reliable OpenVPN experience that Mac users have come to expect with Viscosity.

Viscosity for Windows isn’t a simple port over to a new platform. It has been designed from the ground up to fit perfectly into the Windows environment. Along with all of the standard features provided by Viscosity, Viscosity for Windows offers many additional Windows-specialized features, including:

• An attractive Aero optimized interface and connection editor
• The ability to run under both administrator and standard user accounts
• Windows style notifications and alerts
• No UAC prompts or changes needed whenever Viscosity is launched
• The ability to bundle Viscosity with connections and settings
• The ability to store username and passwords in the Windows credential system
• Batch (.bat) & VBS (.vbs) scripting support
• Much more!

We encourage you to download Viscosity and take advantage of the free 30-day trial period to try out Viscosity for yourself. And like the Mac version, Viscosity is just $9 to buy.