After a client device issues a request, a verification stub component receives the request. Then, the verification stub component obtains a current state of the client device from a client state table. The verification stub component evaluates whether the request is valid or not by analyzing a content and context of the request and checking the request against a protocol matrix. If the request is valid, the verification stub component updates the current state of the client device in the current state table, and forwards the request to a server device. Otherwise, the verification stub component creates a report describing the request is invalid, and evaluates whether the server can process the request. If the server cannot process the request, the verification stub component interrupts the request and forwards the report to the client device. Otherwise, the verification stub component provides the request to the server device.