In the spirit of improving Hue cloud network security, Hue will use SNI (Server Name Indication) starting April 30, 2019 and your Hue integration support of SNI is required.
SNI is stable for more than a decade and we don’t expect integration issues by eliminating support for non-SNI integrations. If you wish to continue using Hue Remote API, please verify that your Hue integration supports SNI. Please let us know if you have any questions.