US Patent 9602505 Dynamic access control

A computer-implemented method for securing data and computer systems is described. In one embodiment, a request to connect to a server is received at an intermediary network device. It is detected, at the intermediary network device, that the server uses a one-time password (OTP) protocol. Based at least in part on the detecting that the server uses an OTP protocol, an action is performed by the intermediary network device. The action may include blocking, at the intermediary network device, a connection other than the connection to the server that uses the OTP protocol.