A system or method for network access protection executes steps for receiving, at a server, an access request for access to at least one network resource from a client machine, the access request including account authentication information comprising an account identifier and password, obtaining a client machine identifier from the client machine in response to receiving the request for access, and controlling access to the network resource in response to the access request by authorizing access to the network resource for the access request if the client machine identifier matches a registered machine identifier that is registered for use with the account authentication information and the account authentication information matches registered information for a valid account, but denying access to the network resource if the client machine identifier does not match a registered client machine identifier that is registered for use with the account authentication information.