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A very simple Delphi application (with TRESTClient, TRESTResponse and TRESTRequest) configured for a GET operation to our server fails after the most recent Windows 10 update (KB5018410 rolled out on 10 October 2022). It reports 'Error sending data: (12175) A security error occurred'. Rolling back the update works again. The URL that I am testing is https://yams.ked.co.za/version Insomnia, Firefox, Chrome, Edge and other clients have no problems with the polling. Any advice would be very much appreciated

My 2 cents : For Displaying and animating : - https://github.com/TomDannert/GIFImage - Skia4Delphi ! I do not advise you to use http://www.raysoftware.cn/559.html : It unfortunaly not work on all gif, and on recent compiler, it does not pass range checking. Tom Dannert's version (https://github.com/TomDannert/GIFImage ) is a far better start if you want to write a Gif Writer. It is right that, under FMX, full cross platform (linux and mobile included), I do not have direct solution to write GIF.

The issue was not caused by the Delphi components itself, but by the WinApi interface they use, which acted faulty after the Windows update. As stated in my previous comment the issue is already solved with KB5020435. Thus I have no need to switch to any 3rd party component.

It would have helped to mention that you're compiling for iOS Simulator (i.e not just iOS) Please refer to: https://blogs.embarcadero.com/rad-studio-11-2-alexandria-patch-1-available/

There is always Indy's TIdHTTP component The standard TIdSSLIOHandlerSocketOpenSSL component will support up to TLS 1.2 with OpenSSL 1.0.2, and this WIP SSLIOHandler will handle TLS 1.3 with OpenSSL 1.1+.