Cendio is proud to present ThinLinc 4.20.0, with more than 100 enhancements and fixes. The most prominent changes are:
ThinLinc's web-based services, Web Access and web administration, have both been overhauled to make sure they work well behind reverse HTTP proxies, even in complex cluster configurations. This includes making sure that the correct client IP address is used in logs and when authenticating.
Some configuration is still required in the HTTP proxy. See the ThinLinc Administrator's Guide for details.
The ThinLinc client now remembers previously used servers and will offer suggestions in the server name field, making it easier to switch between multiple ThinLinc installations.
ThinLinc Web Access can now be customized with a custom logo, page title, and background image, to give end users a familiar experience when accessing the system. The settings can also be conveniently configured and previewed through the ThinLinc web administration interface.
32-bit applications are no longer fully supported in a ThinLinc session. Base functionality will be available on a "best effort" basis, but full functionality requires upgrading to 64-bit applications.
The ThinLinc client no longer supports 32-bit Windows. A 64-bit Windows installation is now required. The ThinLinc server remains backwards compatible with older clients, for those users who cannot upgrade in the near future.
ThinLinc works on most modern Linux distributions and is supported on any platform that fulfills our documented requirements.
In the list below, the bug number is given in parentheses. For more information, visit https://bugzilla.cendio.com.
ThinLinc web administration and Web Access are now easier to deploy behind a reverse proxy. (5394, 8700, 8701, 8702, 8719, 8721)
ThinLinc web administration and Web Access can now be configured to handle the X-Forwarded-For header to get the correct client IP address when using a reverse proxy. (7466)
32-bit applications are no longer fully supported in a ThinLinc session. (8565)
Users can now hide the currently configured profile chooser introduction for future logins. An updated introduction will reset this user preference. The system administrator can also force the introduction to be shown on every login. (7072)
The profile chooser now pre-selects the previously used profile. (3510)
Session profiles for the COSMIC, i3, and LXQt desktop environments are now provided. (7340, 7570, 8410)
The ThinLinc server installer will now look for installed licenses, and present a warning if none of the found licenses will be valid after the upgrade. (2541)
Fixed multiple vulnerabilities where a malicious application could cause the X server to crash or execute arbitrary code. [CVE-2025-49175, CVE-2025-49176, CVE-2025-49177, CVE-2025-49178, CVE-2025-49179, CVE-2025-49180, https://gitlab.freedesktop.org/xorg/xserver/-/commit/4fc4d76b] (8613)
The ThinLinc server setup will now remember and suggest the previously chosen alternatives for SELinux, AppArmor, printers, and firewall settings on subsequent runs. (8615, 8664)
The ThinLinc server installer now allows the choice of which ThinLinc services to enable in the local firewall. (4467)
The server installer now offers a clear exit path when the latest version of the ThinLinc server is already installed. (7941)
The ThinLinc client now shows a list of recently used servers. It is also possible to search the suggestions while typing the server name. (5503)
The ThinLinc client has an updated layout in the Options window. (8662)
The installer for the ThinLinc client on Windows is now translated to Russian and Turkish. These translations were previously disabled because of incompatibilities with some systems. (7447)
The ThinLinc client for macOS is now packaged using the DMG format instead of the ISO format, for increased compatibility. (4329)
The ThinLinc client no longer supports 32-bit Windows. A 64-bit Windows installation is now required. (8611)
The ThinLinc client for Windows no longer leaks process handles when connected to a session. (8673)
Custom branding can now be applied to the Web Access login page. This includes setting a custom logo, page title, and background image. (5085, 8712)
It is now easier to navigate the ThinLinc Web Access log file. There are no longer any HTTP requests logged in the default log level. (8409)
The ThinLinc Web Access login can now handle larger passwords and tokens. (8262)
Added protection to prevent accidentally closing a ThinLinc Web Access session window. (8519)
A Caps Lock indicator and password visibility toggle have been added for the password field on the Web Access login page. (8707, 8514)
The ThinLinc client now supports authenticating using YubiKeys with 4096-bit RSA keys. (8602)
The ThinLinc server has improved compatibility with smart card applications that rely on undocumented behavior. This could previously result in smart card applications becoming unresponsive and using excessive CPU resources. (8295)
The ThinLinc command-line tool "tlctl" now has the possibility to refresh the session database when listing sessions and load. (8549)
The ThinLinc command-line tool "tlctl" now uses colors to emphasize the most important parts of the output. (8708)
The appearance of the license usage graphs in the ThinLinc web administration has been improved. (3850, 8275, 8634)
Fixed an issue where the license usage graphs in the ThinLinc web administration would be displayed using the system language rather than in English. (8004)
Load and Sessions tables in the ThinLinc web administration can now be sorted by pressing the column headers. (8583)
Profile icons and screenshots can now be previewed in the ThinLinc web administration interface. (8715)
The ThinLinc server can now be configured to send system administrator notifications, such as license warnings, to more than one email address. (7436)
The ThinLinc Administrator's Guide is now available through the web administration interface. This guide always targets the same version as the installed ThinLinc server, and can be used without internet access. (8657, 8666)
It is now easier to navigate the ThinLinc web administration log file. There are no longer any HTTP requests logged in the default log level. (8409)
New parameter: /profiles/force_intro. Controls whether users are allowed to hide the profile chooser introduction.
New configuration folder: /webaccess/branding/. Holds settings relating to custom branding of the Web Access login page.
The /vsmserver/admin_email parameter now accepts multiple email addresses.
The /profiles/default parameter is now only the preselected choice for first time users. Subsequent logins prioritize the user's selected profile.
Default profiles for COSMIC, LXQt and i3 have been added under /profiles and to the /profiles/order parameter.
A complete configuration reference can be found in the ThinLinc Administrator's Guide.
ThinLinc has also been enhanced in many other ways. The complete list of corrected issues is:
1210, 2349, 2541, 2652, 3308, 3510, 3513, 3850, 4329, 4396, 4467, 4852, 5085, 5394, 5503, 5636, 5658, 5673, 7072, 7340, 7436, 7447, 7466, 7570, 7757, 7768, 7817, 7941, 7981, 8004, 8079, 8165, 8190, 8262, 8275, 8295, 8341, 8361, 8367, 8407, 8409, 8410, 8419, 8487, 8514, 8519, 8541, 8549, 8565, 8583, 8589, 8591, 8593, 8602, 8607, 8608, 8609, 8610, 8611, 8613, 8615, 8619, 8624, 8627, 8631, 8632, 8633, 8634, 8636, 8638, 8641, 8643, 8644, 8645, 8647, 8657, 8658, 8662, 8664, 8666, 8667, 8668, 8669, 8672, 8673, 8676, 8677, 8678, 8679, 8680, 8694, 8695, 8696, 8700, 8701, 8702, 8707, 8708, 8709, 8712, 8714, 8715, 8719, 8720, 8721, 8722, 8723, 8728, 8736, 8741, 8743
The ThinLinc server software that you can download at https://www.cendio.com/thinlinc/download/ will work for 3 concurrent users by default. You are allowed to use ThinLinc for free up to 10 users; the conditions for use of the 10 free you can read at other headings in this FAQ.
To increase your limit from 3 to 10, you need to download and install a community license file. If you want to go for more than 10 users, you must buy user licenses from Cendio. For more information, see other headings in this FAQ.
If you don’t renew the subscription, you are not allowed to use the ThinLinc software. The customer shall then cease using the program and shall uninstall the program from any computers, servers, or other equipment. If the customer is late with the renewal with entering into a new subscription, Cendio is entitled to charge a reinstatement fee.
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 support@cendio.com and refer to your ID, and we will issue new user licenses for you.
Contact Cendio support team at support@cendio.com. 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 sales@cendio.com 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 sales@cendio.com.
Cendio offers a non-profit discount for organizations that fall under the definitions that can be found at the https://cendio.com/thinlinc/shop/non-profit-organization/. Please contact us at sales@cendio.com 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 sales@cendio.com.
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 sales@cendio.com
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 concurrent sessions, additional user licenses need to be installed on the server. User licenses are bought from Cendio. Please note, when placing user licenses into the ThinLinc server, the counting starts from 0. This means that you need to buy and install the number of user licenses that you need, both from a technical and legal perspective.
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 https://cendio.com/resources/docs/tag/tlwebadm_status.html#tlwebadm-status . ThinLinc will notify you when the limit of licenses has been reached, for detailed information see, https://cendio.com/resources/docs/tag/licensehandling.html?highlight=soft
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 https://cendio.com/thinlinc/docs/legal/eula
We offer technical support for a ThinLinc version for 3 years after its release date. After 3 years, Cendio can’t guarantee support on that specific version. We recommend upgrading the ThinLinc server after each bi-yearly release.
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.
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 or download 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 provided by default, updated licenses will be provided 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.
If the Agreement is not prolonged or if the fees for the agreed subscription are not paid when due, the user licenses will cease to be valid. The customer shall then cease using the program and shall uninstall the program from any computers, servers, or other equipment. The ThinLinc software 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 purchased 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.
From a technical and usability perspective, there is no difference between the free and commercial ThinLinc. The difference is from a legal and support perspective. For non-paying use, you are only allowed to use up to 10 users of the software, and the support is provided through the ThinLinc community. When you need more than 10 users, you are entitled to the commercial version of ThinLinc that is packaged in a so-called subscription. The subscription also provides you with access to high-level professional support 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.
Every valid ThinLinc Subscription Agreement has a specific ID. Contact Cendio at support@cendio.com and refer to your ID, and we will issue new user licenses for you.
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 concurrent sessions, additional user licenses need to be installed on the server. User licenses are bought from Cendio. Please note, when placing user licenses into the ThinLinc server, the counting starts from 0. This means that you need to buy and install the number of user licenses that you need, both from a technical and legal perspective.
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 https://cendio.com/resources/docs/tag/tlwebadm_status.html#tlwebadm-status . ThinLinc will notify you when the limit of licenses has been reached, for detailed information see, https://cendio.com/resources/docs/tag/licensehandling.html?highlight=soft
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 https://cendio.com/thinlinc/docs/legal/eula
We offer technical support for a ThinLinc version for 3 years after its release date. After 3 years, Cendio can’t guarantee support on that specific version. We recommend upgrading the ThinLinc server after each bi-yearly release.
The ThinLinc server software that you can download at https://www.cendio.com/thinlinc/download/ will work for 3 concurrent users by default. You are allowed to use ThinLinc for free up to 10 users; the conditions for use of the 10 free you can read at other headings in this FAQ.
To increase your limit from 3 to 10, you need to download and install a community license file. If you want to go for more than 10 users, you must buy user licenses from Cendio. For more information, see other headings in this FAQ.
If you don’t renew the subscription, you are not allowed to use the ThinLinc software. The customer shall then cease using the program and shall uninstall the program from any computers, servers, or other equipment. If the customer is late with the renewal with entering into a new subscription, Cendio is entitled to charge a reinstatement fee.
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 support@cendio.com and refer to your ID, and we will issue new user licenses for you.
Contact Cendio support team at support@cendio.com. 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 sales@cendio.com 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 sales@cendio.com.
Cendio offers a non-profit discount for organizations that fall under the definitions that can be found at the https://cendio.com/thinlinc/shop/non-profit-organization/. Please contact us at sales@cendio.com 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 sales@cendio.com.
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 sales@cendio.com
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.
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 or download 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 provided by default, updated licenses will be provided 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.
If the Agreement is not prolonged or if the fees for the agreed subscription are not paid when due, the user licenses will cease to be valid. The customer shall then cease using the program and shall uninstall the program from any computers, servers, or other equipment. The ThinLinc software 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 purchased 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.
From a technical and usability perspective, there is no difference between the free and commercial ThinLinc. The difference is from a legal and support perspective. For non-paying use, you are only allowed to use up to 10 users of the software, and the support is provided through the ThinLinc community. When you need more than 10 users, you are entitled to the commercial version of ThinLinc that is packaged in a so-called subscription. The subscription also provides you with access to high-level professional support 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.
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.
