Over the weekend Microsoft unleashed a flurry of Windows updates to fix the 'gov.uk' bug
Last Tuesday Microsoft released patches — Monthly Rollups, Security-only, or Cumulative Updates — for every version of Windows. Every single one of those patches included a bug that changed the way Internet Explorer and Edge handle secure connections for the top-level domain gov.uk.
Here’s how Microsoft describes it:
After installing the May 14, 2019 update, some gov.uk websites that don’t support HTTP Strict Transport Security (HSTS) may not be accessible through Internet Explorer 11 or Microsoft Edge.