Refer to the exhibit.

The exhibit shows the administrator account using IPv4 trusted hosts with a broad entry that effectively allows management access attempts from any IPv4 source. To reduce brute force exposure against the FortiWeb GUI, the administrator should restrict the trusted host entry to a specific trusted management IP address or subnet. FortiWeb administrator accounts can be limited by trusted host settings, so only defined source addresses can even attempt to authenticate. Changing the upstream device may help, but FortiWeb should still enforce its own management access restriction. Deleting the built-in administrator account does not solve the source-access problem. Changing the access profile to read-only only limits privileges after login; it does not prevent brute force attempts against the GUI.

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