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On October 18, 2021 Progress will be removing support for TLS 1.0 and 1.1 protocols. Progress is discontinuing the support for these protocols to ensure Progress web services are using industry standard security protocols.

What is changing?

Progress is updating application security protocols and deprecating support for TLS 1.0 and 1.1. This means any attempted connections while using older browsers that only support TLS 1.0 and 1.1 will no longer be allowed. Only TLS 1.2 and higher are supported by Progress.

All Telerik websites, including* and*, will be affected by this change.

Automations, build servers or SDKs that target .NET earlier than 4.7 to communicate with Progress NuGet servers or other Progress APIs also will likely be affected.

How to Check If You Are Affected:

If your Build scripts, automations and SDKs target .NET are earlier than 4.7 and authenticate against the Progress NuGet server, you are affected. For more information, visit this article on the .NET docs that covers TLS best practices.

To check your browser for TLS 1.2 support: Visit the SSL/TLS Capabilities testing page. Using old browsers brings high risk to all online activities. If you’ve already upgraded to the latest version of your browser, this may not apply to you. Please accept our sincere apologies if this information is irrelevant to you.

What is TLS?

Transport Layer Security (TLS) is a protocol that ensures privacy between communicating applications and their users on the Internet. When a server and client communicate, TLS ensures that no third-party may eavesdrop or tamper with any message. TLS is the successor to the Secure Sockets Layer (SSL).

About the Author

Genady Sergeev

is a Senior Manager in the Progress Web UI & Tools division, which develops the Kendo UI, UI for ASP.NET MVC and UI for ASP.NET AJAX products. He joined the company back in 2009 and since then he has been involved with the web UI products on a variety of levels, from a single contributor to a senior manager. Genady's main interests are in the field of client-side development and he is a big fan of the DevOps philosophy. In his free time he likes skiing and cross-country cycling.

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