From March 2020, the internet protocols TLS 1.0 and TLS 1.1 will no longer be supported by the most common browsers. Read more about it in this blog.
The configuration modification in our production environment will be carried out early in the morning of Tuesday 28 April, between 01:00 and 05:00 CET.
You may experience a short interruption in your environment during this modification. As a precaution, we ask you to check the working of your environment the day BEFORE and the day AFTERthe maintenance. Your application, users or partners may still be using the outdated protocols. Should you have any questions in response to this message, you can contact us via the usual support channels.
Check TL version
There are multiple ways of checking whether you are using a TLS version 1.0 or 1.1 which is almost end-of-life. You can see whether your website uses modern internet standards via internet.nl, for example.
Another (and in our opinion, better option) is SSL Labs. This website checks your website quite thoroughly for the use of SSL and TLS, in particular. SSL Labs uses a different standard, specifically the standard which is also used by Mozilla (the organisation behind the Firefox browser).