Version 1.5.4 of Viscosity for both Mac and Windows is now available!

Version 1.5.4 Mac Release Notes:

Version 1.5.4 Windows Release Notes:

The 1.5.4 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit our support section.

Version 1.5.3 of Viscosity for both Mac and Windows is now available! This version updates OpenVPN to version 2.3.6, and includes plenty of small enhancements and fixes.

Version 1.5.3 Mac Release Notes:

Version 1.5.3 Windows Release Notes:

The 1.5.3 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit our support section.

Version 1.5.3 of Viscosity for both Mac and Windows is now available!

Version 1.5.3 Mac Release Notes:

Version 1.5.3 Windows Release Notes:

The 1.5.3 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit our support section.

Version 1.5.2 of Viscosity for Windows is now available! This version includes improved support for Windows 10 as well as a number of small fixes and improvements.

Version 1.5.2 Windows Release Notes:

The 1.5.2 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit our support section.

Viscosity version 1.5.2 for Mac and version 1.5.1 for Windows are now available! These updates bring a number of small feature additions and fixes based on community feedback.

Version 1.5.2 Mac Release Notes:

Version 1.5.1 Windows Release Notes:

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

Viscosity version 1.5 for Windows and version 1.5.1 for Mac are now available! Version 1.5 brings performance and security improvements to the Windows version, as well as an enhanced Details window under modern Windows operating systems.

The 1.5.1 update for the Mac version of Viscosity brings a number of small fixes and improvements based off feedback from the community. Please don't hesitate to post on our support forum if you encounter any issues or would like to offer feedback!

Version 1.5 Windows Release Notes:

Version 1.5.1 Mac Release Notes:

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

Viscosity version 1.5 for Mac is now available! This is our biggest update yet, with massive performance and security improvements! This version also brings full 64-bit support, greater support for the latest Mac OS 10.10 (Yosemite) beta and preview versions, and a snazzy new default menu icon with dark mode support.

Please note that version 1.5 ends support for Mac OS 10.5 and 10.6. Viscosity 1.4.10 is still available from the legacy downloads section for these users. In addition, with the move to 64-bit, VPN administrators utilising PKCS#11 should ensure that their driver/provider files are up to date and have 64-bit support.

Version 1.5 Mac Release Notes:

The 1.5 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit our support section.

Hot off the heels of version 1.4.9 comes version 1.4.10. Version 1.4.10 addresses a Man-In-The-Middle (MITM) vulnerability in OpenSSL announced today (CVE-2014-0224). OpenSSL has been updated to version 1.0.1h, which includes a fix for this issue. All users are encouraged to update to this latest version of Viscosity to ensure they remain secure.

For more information regarding the SSL/TLS MITM vulnerability in OpenSSL please refer to the OpenSSL Security Advisory.

Version 1.4.10 Mac Release Notes:

Version 1.4.10 Windows Release Notes:

The 1.4.10 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit our support section.

Version 1.4.9 of Viscosity for both Mac and Windows has just been released! The most notable changes include an update to OpenVPN version 2.3.4, an optional single shared network adapter mode for Windows users, and preliminary Mac OS 10.10 (Yosemite) support for the Mac developers out there with early access.

Version 1.4.9 Mac Release Notes:

Version 1.4.9 Windows Release Notes:

The 1.4.9 update can be automatically installed from inside Viscosity, or downloaded and manually installed. For support with this version please visit our support section.

Version 1.4.8 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.