This error occurs when MakeMKV cannot reach its key server to download the Hashed Keys (HK) required to decrypt specific (often 4K UHD) discs . Because the servers are frequently hosted in the Russian Federation
makemkvcon64.exe --debug=stdout info
MakeMKV stores downloaded HK data locally. If it’s corrupted, delete it: makemkv automatic hk downloading is disabled or failed upd
Sometimes the error appears after successful HK download, but before disc insertion. This is a cosmetic bug in some MakeMKV versions. Test by inserting a known new Blu-ray; if it rips successfully, ignore the message. This error occurs when MakeMKV cannot reach its