Kaspersky for Kids appears to block the Mojang login to the my.minecraft.com site.
I tried this with multiple browsers. Messages flash past as the login fails but it appears to be that the authentication token is being blocked, and the user is returned to the login screen as if no login were attempted. This differs from incorrect user/password, which provides a red error box.
When I try the login on an adult account on the same machine, it works fine.
Works fine on other machines.
Only the kid’s accounts on the machine fail.
It looks like a cookie is being blocked, either on send or receive.
How can I stop this behaviour?
Is there a site whitelist?