A network security system includes a server configured to receive an access request via a network from a remote computing device, a database storing customer account information accessible by the server, and memory accessible by the server and storing a customer notification program. When executed by the server, the program identifies the remote computing device by a device fingerprint and requesting location, determines whether the device fingerprint matches any authorized device fingerprints stored in the database and sends, responsive to a mismatch between the device fingerprint and the authorized device fingerprints, a notification of the request to a customer-specified address. The notification indicates the request, the identity of the remote computing device, and the requesting location. The program may resolve the request responsive to a reply to the notification from the customer-specified address.