Stop simultaneous active directory logins with only one account

Hello,

when I authenticate an user who is in the active directory, as
freeradius answers it to only know if the account exists, I can log
many users in the same time with the same account.

I would that only one user can use his account and if another user
tries to authenticate him with the same account, he will be rejected.

As I use the ntlm_auth command to authenticate users from active
directory, can it possible to do that?

Thanks,
Sylvain Clerc.

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