Hello,
usually I don't publicize my feature request, but in this case I'll do an exception because I think that there is an important lack of security regarding brute force attacks. In fact in this moment there is no way to block an ip address if it tries thousands of times to login in order to use the SMTP proxy (ie. for sending spam), or to use SSL VPN, ecc. The target of brute force is not only the Astaro Unit, but also the Domain Controller that manages the users/groups.
You can find the feature request here:
Ban ip address for x minutes if login fails
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