ThinLinc 4.6.0 Release Notes


Cendio are proud to present ThinLinc 4.6.0, with more than 50 enhancements and fixes. Highlights include performance improvements for native clients, easier upgrading with automatic configuration migration, and improved platform support for SeamlessRDP.

ThinLinc works on most modern Linux distributions. We recommend that you deploy ThinLinc on one of these tested platforms:

  • Red Hat Enterprise Linux Server 7
  • SUSE Linux Enterprise Server 12
  • Ubuntu Desktop 14.04 (64-bit)

Please note that ThinLinc is supported on any platform that fulfills our documented requirements. This includes Oracle Linux, Linux Mint, and Debian.

Changes in This Release

In the list below, the bug number is given in parentheses. For more information, visit


  • ThinLinc Setup will now assist you in migrating your configuration when upgrading to a new version of ThinLinc. (1760)
  • When reconnecting to a ThinLinc session, all existing connections to that sessions will now be disconnected. (2251)
  • OpenSSH has been upgraded to 7.1p2. [CVE-2016-0777, CVE-2016-0778] (5770)
  • Nettle has been upgraded to 3.2. [CVE-2015-8803, CVE-2015-8804] (5788)
  • GnuTLS has been updated to version 3.1.1. (5537)
  • OpenSSL has been updated to version 1.0.2e. (5540)
  • It is now safe to install our Windows software multiple times without rebooting. A bug where files disappeared on reboot after multiple upgrades was found and fixed. (5758)


  • An update to the pixman library reduces CPU usage for certain scaling operations in Xvnc. This is commonly used by for example Firefox when playing online video. (5748)
  • tl-session will no longer try to perform DNS lookups of the "thinlinc" hostname when starting up a new session. (5682)
  • Setting the desktop name using vncconfig will now work again. This allows the client title bar to have the proper title when using tl-single-app. (5726)
  • It is now possible to start ThinLinc sessions on systems using pam_limits with SELinux. (5733)
  • Systems with Python 2.4, such as Red Hat Enterprise Linux 5, could take a long time to start a ThinLinc session. This has been adjusted. (5774)

Native Client

  • The native client can now do multi-threaded handling of VNC data, leading to performance improvements on clients with multiple cores. (5618)
  • Support for Microsoft Windows 10 has been added. (5400)
  • Support for eLux RP 5 has been added. (5681)
  • Support for eLux RL has been removed. (5803)
  • Support for Wyse Enhanced SuSE Linux 11 SP3 has been added, while support for Wyse Enhanced Suse Linux 11 SP2 has been dropped. (5768)
  • The ThinLinc client is now associated with opening .tlclient files on OS X. (5504)
  • A shadowing client will no longer try to export any local devices to the session being shadowed. (5795)
  • Trailing whitespace characters in the server name and username field will no longer cause a login error. (5776)
  • The ThinLinc client will now exit faster on Linux and OS X platforms. (5672)

ThinLinc Web Access

  • An improved zlib implementation improves performance for some use cases. (5623)
  • The tlwebaccess service will now respect the log level given in the configuration file. (5798)

Smart Card Support

  • A bug in tl-crltool caused failures to parse certificate revocation lists for determining whether a certificate was valid or not. This has been fixed. (5806)

Audio Redirection

  • Reloading PulseAudio tunnel modules will no longer cause the client PulseAudio server to fill the log files in some situations. (5717)
  • A case where the PulseAudio in the native client would not be able to connect to a local PulseAudio 7.0 server has been fixed. (5743)

Printing Support

  • thinlocal is now able to determine the content type of a print job using CUPS 1.7 or later; this will avoid sending normal jobs as raw jobs to local printers. (5747)

Windows Integration

  • SeamlessRDP is now supported with Microsoft Windows Server 2012 and 2012 R2. (5245)

Configuration Changes


  • The unused parameter /vsmserver/agentcomm_bind_hostname has been removed. (5763)
  • The parameter /vsmserver/sshd_log_files has been removed. ThinLinc no longer uses the SSH log file to determine the connecting client's IP address. (2796)

A complete configuration reference can be found in the ThinLinc Administrators Guide.

Corrected Issues

ThinLinc has also been enhanced in many other ways. The complete list of corrected issues is:

1760, 2251, 2776, 2796, 2860, 5044, 5045, 5245, 5319, 5332, 5375,
5400, 5439, 5504, 5510, 5535, 5537, 5540, 5546, 5558, 5575, 5618,
5623, 5637, 5642, 5672, 5681, 5682, 5717, 5723, 5724, 5726, 5733,
5743, 5747, 5748, 5758, 5763, 5764, 5768, 5770, 5774, 5776, 5788,
5793, 5795, 5796, 5798, 5803, 5804, 5806, 5818, 5820, 5827, 5840
Debian is a registered trademark of Software in the Public Interest, Inc.
eLux is a registered trademark of UniCon Software GmbH.
Firefox is a registered trademark of The Mozilla Foundation.
Linux is a registered trademark of Linus Torvalds.
Linux Mint is a trademark of Linux Mark Institute.
Oracle is a registered trademark of Oracle Corporation.
OS X is a registered trademarks of Apple Inc.
Red Hat is a registered trademark of Red Hat, Inc.
SuSE is a registered trademark of SUSE LLC.
ThinLinc is a registered trademark of Cendio AB.
Ubuntu is a registered trademark of Canonical Ltd.
Windows is a registered trademark of Microsoft, Inc.
Wyse is a registered trademark of Wyse Technology Inc.

Frequently Asked Questions

  • ThinLinc is packaged in subscriptions with a tiered pricing system. A higher number of subscriptions will give a lower price. The subscriptions can be purchased for different periods, 12, 36 and 60 month. A longer duration will give a greater price. The payment of the subscriptions is done in advance.

    The default rule is that the prices are set in accordance with the number of subscriptions that are purchased at the actual call off. Deviation from this can be eventually agreed if a roll-out plan can be committed in advance.

  • Every valid ThinLinc Subscription Agreement has a specific ID. Contact Cendio at and refer to your ID, and we will issue new user licenses for you.

  • Contact Cendio support team at And refer to your ThinLinc Subscription ID in your support request.

  • We will set up an evaluation account that gives the permission to receive support directly from our technical team. Cendio can also provide trial licenses for more than 10 users. Please contact directly.

  • Cendio wants to sponsor organizations where the business aims to make the world better. This means to help people, regions etc. that really need help. Please contact us a

  • Cendio offers a non-profit discount for organizations that fall under the definitions that can be found at the following link. Please contact us at for pricing. 

  • Cendio will, in good time before expiration of the ThinLinc Subscriptions Agreement, send a reminder by email. The renewal process will follow the same routines that are used in a new or additional purchase.

  • Other set-ups are possible for bigger deals. Contact

  • Purchases can be done directly via invoice, web shop or by a reseller. Cendio is a Swedish and EU company with long experience from doing business with foreign organizations. If you have any questions or need support, please contact us at

  • Best functionality and performance will always be achieved by upgrading to the latest version, both on the server and client-side. A newer version on the client-side will always give a better user experience than a former version. Cendio’s ambition is to keep good compatibility and functionality between the different versions. Historically, good compatibility between versions has been 3-5 years.

  • A ThinLinc set-up consists of a server software, client software and user licenses.

    Server software

    The server software is the heart of ThinLinc installation and handles all sessions, desktop environments and generates the virtual desktop, workspace etc.

    User licenses

    To allow more than 10 sessions to connect access to the server software, user licenses need to be added into the server software. User licenses are bought from Cendio. Please note, when placing user licenses into the ThinLinc server, the counting starts from 0, not 10. In concrete, this means that you need to buy and install the number of user licenses that you need.

    Client software

    The client software is installed on the device that is used to connect to the server and provision the virtual desktop / workspace. If using the web access client, no local installation of client software is needed, the provisioning is generated via the web browser that is installed at the server.

  • It’s up to the licensee to decide who can connect into the server installation. The ThinLinc client software is free of charge and can be downloaded by everyone.

  • The licensing is per organization. There is no limitation on how the ThinLinc user licenses are distributed in the legal organization, as long as the number of consumed licenses don’t exceed the number of paid licenses. It’s allowed to move the user licenses, but not copy.

  • The license use can be seen in the status module, how to manage can be found at . ThinLinc will notify you when the limit of licenses has been reached, for detailed information see,

  • Both the ThinLinc server and client software are free to distribute. The user licenses are connected to a purchase and are not allowed to distribute. For more detailed information, see

  • A specific version of ThinLinc is supported 3 years from release date. After 3 years, Cendio can’t guarantee support.

  • The number of user licenses that will be delivered will be in accordance with the number of subscriptions that have been acquired by the customer. The user licenses are perpetual.

  • When adding user licenses into the ThinLinc server, the counting will start from zero. So if you require 200 users, you need to have 200 user licenses

  • You need to buy user licenses and install them in the ThinLinc server. The user licenses are received through buying ThinLinc subscriptions.

  • It’s easy to add new users into a current ThinLinc set-up. By purchasing additional subscriptions into your agreement, so will we issue additional user licenses.

  • Cendio will, after receiving a valid order, distribute user licenses via email for the latest version after a purchase. If the purchase is a renewal and the customers have already received the latest version, no user licenses will be delivered by default, updated licenses will be delivered on request in this case.

  • It’s possible to merge existing agreements. When doing a merge, the period shall be at least 12 months.

  • The default rule is that the prices are set in accordance with the number of subscriptions that are purchased at the actual call off. Deviation from this can be eventually agreed if a roll-out plan can be committed in advance.

  • The client software packages are free of charge.

  • The ThinLinc license is perpetual and will still work after the expiry date of the ThinLinc subscriptions.


  • Both as an individual and as an organization, it is not allowed to use the free version of ThinLinc if you have valid user licenses.

  • ThinLinc is free to use for up to 10 concurrent users for both individuals and organizations (on a group basis).

  • ThinLinc Subscriptions give the possibility to run more than 10 concurrent users per ThinLinc installation. It also gives technical support directly from Cendio and the right to get upgrades (new versions) for ThinLinc.

  • ThinLinc Premium Subscription gives prioritized answers, faster response time, and direct access to our qualified technical support via telephone service.

  • The free version of ThinLinc is limited to 10 concurrent users and is supported via the ThinLinc Community. The commercial version of ThinLinc is packaged in a so-called subscription and can be scaled for more than 10 users. The subscriptions also give the right to get professional support in ThinLinc directly from the Cendio technical team.

  • ThinLinc is free to use up to 10 users at the same time per individual or organization worldwide, without any obligations. The usage can be 10 installations with one user per each or one installation with 10 users. What matters is that the 10 users aren’t exceeded.

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