Also known as application proxy or application-level proxy, an application gateway is an application program that runs on a firewall system between two networks. When a client program establishes a connection to a destination service, it connects to an application gateway, or proxy. The client then negotiates with the proxy server in order to communicate with the destination service. In effect, the proxy establishes the connection with the destination behind the firewall and acts on behalf of the client, hiding and protecting individual computers on the network behind the firewall. This creates two connections: one between the client and the proxy server and one between the proxy server and the destination. Once connected, the proxy makes all packet-forwarding decisions. Since all communication is conducted through the proxy server, computers behind the firewall are protected.
While this is considered a highly secure method of firewall protection, application gateways require great memory and processor resources compared to other firewall technologies, such as stateful inspection.
- application log
The application log file contains events that are logged by the applications used on a computer system. Events that are written to the application log are determined by the developers of the software program, not the operating system.
- application portfolio
The term used to describe the group of applications that are used and maintained by an enterprise.
- application proxy
See application gateway.
- Application Server
Also called an appserver, an application server is a program that handles all application operations between users and an organization’s backend business applications or databases. An application server is typically used for complex transaction-based applications. To support high-end needs, an application server has to have built-in redundancy, monitor for high-availability, high-performance distributed application services and […]
- Application Service Provider
Abbreviated as ASP, a third-party entity that manages and distributes software-based services and solutions to customers across a wide area network from a central data center. In essence, ASPs are a way for companies to outsource some or almost all aspects of their information technology needs. They may be commercial ventures that cater to customers, […]