Are all product keys made with a keygen impossible to pass WGA now? Did Microsoft move to a whitelist-based system?
Your qestion: Are all product keys made with a keygen impossible to pass WGA now? Answer: YES. It always has been like this. I don't know about any whitelists.
Like kukubau said, YES The keygens which are out there for XP, all seem to activate XP just fine, none validate XP as genuine
WGA is NOT whitelist based, stop with the FUD. The issue is your windows xp corp keygen only generates keys within a PID range not actually used by MS. the pirates did this so they wouldn't copy anyone else's legitmate VLK keys. Once MS figured out what happened, they changed the generation algorithm so those keys were all invalidated for online genuine checks. so NO key generated with the keygen will pass online validation ever.