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How does ThinLinX licensing work?
TLXOS licenses are perpetual, although historically your ability to upgrade TLXOS used to be time-limited to three years from the date of license activation (the "Support Expiry" date, although in pra...
How can I SSH / get root access to a TLXOS device?
For security reasons, no local user account in TLXOS has a password, including the root account, so it is not possible to access to an interactive root shell by any means that involves password entry....
What hardware does TLXOS support? What is each TLXOS edition for?
TLXOS RPi IoT supports all Raspberry Pi models with an ARMv6 CPU, such as the version 1 Pi models, the Zero / Zero W, and the original Compute Module.  TLXOS RPi IoT does not support HDX or Horizon m...
Can I install/upgrade/run TLXOS via PXE boot?
Yes, except on most models of Raspberry Pi.  Pis earlier than the Pi 3 can't network boot at all, the Pi 3B's network boot firmware is so buggy as to be unusable, and while the the Pi 3B+ can network ...
Why am I getting a "license revoked" error when installing a license on RePC/SFF?
It's likely that you are trying to license hardware that we have blacklisted. Our licensing of x86 hardware is critically dependent on the mainboard manufacturer providing a DMI/SMBIOS product UUID th...
Why is there no toolbar in a fullscreen Citrix/Horizon desktop on my Raspberry Pi?
Both Citrix Workspace App and VMware Horizon Client have minimally functional support for H.264 hardware acceleration that prevents use of their drop-down toolbars. The nature of the H.264 hardware ac...
Why doesn't multimedia/HTML5 redirection work?
We deliberately disabled client-side multimedia and HTML5 rendering in TLXOS for HDX and Horizon modes because it just wasn't worth the hassle.  The Linux ports of Citrix Workspace App and VMware Hori...
Why is my CA certificate not recognized/trusted?
If you encounter problems uploading a CA certificate to your TLXOS device, it is probably because it is in the wrong format.  There is a binary format (DER) and a text format (PEM/Base64) and TLXOS re...
Does TLXOS include a VNC server?
Yes, TLXOS has a VNC-based session shadowing feature, but it doesn't work the way that you probably think it does.  TLXOS uses stunnel-encapsulated reverse VNC, for three reasons: Forward VNC connecti...
Can I install additional software on TLXOS?
Yes.  TLXOS is fundamentally just Debian Linux, so you can use standard Debian tools such as apt-cache and apt-get to locate and install additional software, and perform whatever configuration changes...
Can I customize the installation image prior to install?
Not really.  Since TLXOS is intended to be a product rather than a custom solution, our main strategy is to perform post-install configuration using TMS rather than pre-install customization. ISFF and...
I can't boot the USB installer on my Intel NUC / Compute Stick!
There are several known issues with the UEFI BIOS on Intel Compute Sticks and certain NUC models (mainly the more recent ones).: In order to boot TLXOS (or pretty much anything other than Windows), yo...
How can I stop Citrix sessions spontaneously disconnecting on my Raspberry Pi?
This is most likely the result of Workspace App crashing, which in turn is likely to be related to use of H.264 hardware acceleration. Up until Reciever 13.7.0, "our" ctxh264.so add-on (which is actua...
Why aren't my RDP mode USB redirections working?
Unlike Citrix and Horizon clients, the RDP client doesn't have a useful default position on USB device redirection and will not attempt to redirect anything by default.  Consequently, if you want RDP ...
How can I auto-launch a fullscreen Citrix/Horizon app/desktop only (no app browser)?
It is possible to configure both HDX and Horizon modes to launch a specific published application or desktop without ever letting the user access the main Workspace App Horizon Client / UI.  In both c...
How can I lock down configuration so that users can't mess with it?
You were probably hoping for a solution resembling Active Directory Group Policy, but we don't have the resources to do anything that sophisticated yet (read as: you aren't paying us enough for that!)...
Can I install TLXOS without overwriting pre-existing storage?
It is not obvious at first glance that it is possible to perform a "careful install" of TLXOS ISFF and RePC by using the installer's "Upgrade/Recover TLXOS" menu option rather than the "Wipe Everythin...
In HDX mode, why isn't auto-login working / why do I have to log in twice?
If HDX mode is asking for logon credentials more than once, or credentials saved using the "Auto Login" feature are being ignored and you are still being interactively prompted, then the most likely c...
CUPS printer redirection (using Citrix Universal Print Driver) isn't working!
Unfortunately, while redirection of printers from a Windows client is simple and "just works", high-level redirection of printers from a Linux client is arcane and difficult.  If the printer is connec...
Why is the keyboard layout still ENG (US) in my RDP/Citrix desktop?
Windows and Linux handle keyboard layout in fundamentally incompatible ways.  The Windows taskbar keyboard layout setting that you are looking at is really only meaningful for Windows clients - Linux ...
Why aren't my devices showing up in TMS?
Because clients can't locate a remote TMS server by magic!  Unless your devices are on the same TCP/IP subnet as the TMS server - in which case they will locate it by detecting periodic broadcasts - y...
I am getting "SSL handshake error" when trying to install licenses using TMS. How do I fix this?
This can happen on old or unpatched Windows hosts.  We think that this is probably caused by not having the necessary CA certificate installed. We've been told that starting Internet Explorer / Micros...
How many gigabytes of RAM does my Pi need?
There are a few use cases for which a Pi with 2 GB of RAM might be beneficial: Use of Video Conference mode - this application uses a lot of RAM Use of a local web browser (Web or Digital Signage mod...
What is the difference between TLXOS 4.8.x and 4.10.x? Which do I need?
Short answer: The releases are functionally near-identical, the main difference is that 4.8.x has older Citrix and VMware client versions; use 4.8.x only if you need to, and 4.10.x otherwise. Long Ans...
Why do some of my devices show a Support Expiry date while others show "Never"?
Because we are phasing out the Support Expiry concept.  We've concluded that so little of our income comes from license renewals that this limitation just causes needless confusion and - because of hi...
I can't / don't want to use Windows. Is there a ".img" version of the installation image?
If you want to install TLXOS RPi, consider using Raspberry Pi Imager instead.  We have made it easy to image SD cards using this tool. ThinLinX's own installation image is provided in Windows self-ext...
How can I redirect a microphone in Horizon mode on the Pi?
Unfortunately, for reasons beyond ThinLinX's control, this is difficult, and in many cases impossible.  USB audio redirection is the only available option, and this is unsafe and unreliable. The Raspb...
The web UI wants to run "xdg-open", but this does nothing. What now?
"xdg-open" is a generic means of launching a helper application from a web browser in Linux.  Commercial web UIs often use this to either try to detect the existence of, or install, a better alternati...
Why isn't USB redirection working for my Pi-connected peripheral?
There could be application/mode-specific reasons for this - you may wish to check other Knowledgebase articles specific to RDP mode and
I installed TLXOS but only see the ThinLinX home page in a web browser. What's wrong?
TL;DR: quit the web browser using File->Exit, and you'll see some more options. TLXOS is a very minimal O/S.  ThinLinX doesn't believe in flashy customisable local GUIs - if you want your thin clie...
How do I get out of fullscreen mode?
The answer depends on which application you are using, and whether or not you have enabled ThinLinX's Kiosk Mode option. Many applications, such as FreeRDP (RDP mode), Citrix Workspace App (HDX or Web...
Is there a virtual appliance for managing TLXOS devices?
Yes, but it is very out-of-date and is not currently maintained as it was diverting staff time away from higher priority work.  We hope to provide a new version of this based on CentOS 8 (rather than ...
How can I reconfigure TLXOS while an app is running / what are the keyboard shortcuts?
See http://help.thinlinx.com/knowledgebase.php?article=63 for more information on how to escape from a running fullscreen application. When the local window manager has keyboard focus - which is any t...
How can I change the boot screen to show our own logo instead?
You may change the boot image if you wish - we use the usual Plymouth boot splash system used by most mainstream Linux distributions, and have not gone out of our way to obfuscate this in any way - bu...
Can I upgrade TLXOS without using TMS or reinstalling from scratch?
Using TMS is the best and easiest way to perform TLXOS upgrades, and TMS is currently free, so there is no reason for you not to use it. However, we have given some thought to providing an alternative...
How can I protect clients from rogue/unauthorized TMS servers?
Starting from TMS/tms-client 8.3.0, it is possible to use your own Public Key Infrastructure for TMS and tms_client.  This is useful in order to prevent unauthorized TMS instances from reconfiguring y...
Why are some version numbers in TMS blue?
Because that version is out of date. TMS will display Firmware and TMS Client version numbers using blue rather than black text if a later version is known to be available.  It's a gentle hint that yo...