Open Scanner Protocol (OSP) The Open Scanner Protocol is designed to allow controlling various vulnerability scanners. These scanners must either offer the protocol OSP on their own or be connected via an adapter (“OSP wrapper”). Greenbone Management Protocol (GMP) The Greenbone Management Protocol is the central API allowing to control all functionalities of the Greenbone Vulnerability Manager and thus of the Greenbone Security Manager appliances as well. Even the web-client GSA exclusively uses GMP to communicate with the back-end. Technically speaking, GMP is a XML-based human-readable, stateless request-response protocol.