NoMachine Support

Your questions answered

Knowledge Base

Searching in: Software Updates
Filter the search results
Released on:
Searching in: Software Updates
ID: SU04Q00203
Released on:  2019-04-05
Last update: 2019-04-05
NoMachine 6.6.8 now available for download

Luxembourg, April 5th, 2019

NoMachine today announced an important software update offering multiple enhancements, the most significant of which is the inclusion of the AVC/H.264 software codec to the free-to-use packages for Windows, Linux, Mac and Raspberry: NoMachine and NoMachine Enterprise Client. From today, with the release of version 6.6.8, H.264 software encoding and decoding is available to everyone using NoMachine software.

NoMachine always prefers to use hardware encoding to produce the contents of the screen, using the GPU and the tools and methods it makes available. However, there are cases in which the GPU does not provide these tools or hardware encoding is not available. In these cases, NoMachine "falls back" to software encoding, which is slower and does not allow us to offer the same level of interactivity. Similarly on the client, where a hardware decoder is not available, software decoding is used.

In previous free versions, the software encoder and decoder used were based on the VP8 standard, unless the user had purchased the additional AVC Pack which includes the libraries, protected by an international patent by the MPEG LA consortium, and which therefore required a license fee.

From this version, NoMachine has decided to include these libraries covering the costs of the user license fees at its own expense, thus offering the best performance offered by the video encoding standard known as AVC/H.264. This, as already mentioned, where the GPU or HW system in use does not offer an H.264 hardware encoder or decoder, which, again as mentioned, is always the preferred method by NoMachine software.

This update also introduces other enhancements such as improvements to how NoMachine server handles the heaviest peaks of user log-in demand, and the possibility to define the rate control mode ('bitrate' or 'quality') in sessions where multi-media is being streamed. Additionally, the OpenSSL libraries provided by NoMachine have been updated to OpenSSL v. 1.0.2r.


The full list of enhancements and bug fixes are:

FR03Q03801 Including the H.264 libraries in all NoMachine packages
FR02Q03777 Adding the EnablePublicPrinter key to the node configuration
FR03Q03790 Setting a default interval for NoMachine log rotation when no parameter is specified
FR02Q03787 Adding the EncoderMode key to the node configuration
FR02Q03786 Adding an option to force the encoder's rate control mode
FR02Q03782 Supporting the execution of custom scripts triggered by the user's logout event
FR06O03450 Supporting key-based authentication method via web (for NX protocol)
FR02Q03776 Giving the possibility to stop sharing a printer as public
FR04Q03813 Updating the OpenSSL libraries provided by NoMachine to version 1.0.2r
FR04Q03812 Updating nxhtd to Apache v. 2.4.39
FR03Q03803 Improving access to NoMachine backend for multiple concurrent connections

TR02P08421 Virtual desktop mode is ignored for custom sessions on the web
TR12P09040 Wrong file permissions might lead to "Connection Refused 111" error
TR03Q09172 The nxserver --daemon process suddenly terminates during the initialization of a new virtual desktop
TR05P08581 Cannot connect via web from an external network when WebRTC is enabled
TR03P08450 Symlinks are not handled correctly by the NoMachine disk service
TR02Q09163 The nxdevice directory is not cleaned in case of session failure
TR03Q09205 Building NoMachine USB module fails on Linux Kernel v. 5.0
TR03Q09208 Kerberos ticket is not removed when the session is closed
TR03Q09207 Settings in the default.nxs connection file are ignored if the file is not specified in the URL


Supported Platforms

Windows 32-bit/64-bit XP/Vista/7/8/8.1/10

Windows Server 2008/2012/2016

Mac OS X Intel 64-bit 10.7 to 10.14

Linux 32-bit and 64-bit

RHEL 4 to RHEL 7
SLED 10 to SLED 15
SLES 10 to SLES 15
openSUSE 10.x to openSUSE 15.x
Mandriva 2009 to Mandriva 2011
Fedora 10 to Fedora 29
Debian 4.0 to Debian 9
Ubuntu 8.04 to Ubuntu 18.10

Raspberry Pi 2/3 ARMv6/ARMv7/ARMv8


Important notices

All customers with version 4 or 5 installed are invited to read the following document available in the Knowledge Base for further information about what has changed and how to proceed with updating to version 6:


Download NoMachine Packages

You can download the latest packages suitable for your Operating System from the NoMachine Web site at the following URL:

Customers with valid subscriptions should log in to their customer area and download the "Production version".

Automatic updates

The automatic check for updates is scheduled to check our repositories every two days.

To update the free NoMachine package:

  • - Open the NoMachine User Interface from your Programs Menu.
  • - Click on 'Settings', then on the 'Server preferences' and finally on 'Updates'.
  • - Then click on the 'Check now' button.

To update the NoMachine Enterprise Client immediately:

  • - Click on 'Settings' and 'Updates'.
  • - Then click on the 'Check now' button.

More information about the check for automatic updates is available here:

Manual package update

Please follow the instructions to update your installation manually:

On Windows:

  • - Download and save the EXE file.
  • - Double click on the NoMachine executable file.
  • - As for the installation, the Setup Wizard will take you through all steps necessary for updating NoMachine.

On Mac OS X:

  • - Download and save the DMG file.
  • - Double-click on the Disk Image to open it and double-click on the NoMachine program icon.
  • - As for the installation, the Installer will take you through through all steps necessary for updating NoMachine.

On Linux:

You can use the graphical package manager provided by your Linux distribution or update NoMachine by command line by following instructions below. If you don't have the sudo utility installed, log on as superuser ("root") and run the commands without sudo.


  • - Download and save the RPM file.
  • - Update your NoMachine installation by running:
    • # rpm -Uvh <pkgName>_<pkgVersion>_<arch>.rpm


  • - Download and save the DEB file.
  • - Update your NoMachine installation by running:
    • $ sudo dpkg -i <pkgName>_<pkgVersion>_<arch>.deb


  • - Download and save the TAR.GZ file.
  • - Update your NoMachine installation by running:
    • $ cd /usr
    • $ sudo tar xvzf <pkgName>_<pkgVersion>_<arch>.tar.gz
    • $ sudo /usr/NX/nxserver --update
  • If you are installing Enterprise Client or Node run respectively:
    • $ sudo /usr/NX/nxclient --update
    • $ sudo /usr/NX/nxnode --update


Installation and configuration guides for the NoMachine products are available at:


The NoMachine Development Team