Introducing Application Filters

Application filters work with the Firewall service to intercept and process data. Application filters can access the data stream or datagrams associated with a session within the Firewall service. The filters are registered with the Firewall service and act according to events detected by the service. An application filter can perform protocol-specific or system-specific tasks, such as authentication and checking for viruses.

This section contains the following topics, which are best read in sequence:

1. Filter Types
2. Firewall Events
3. Connection Emulation
4. Checking Access Rights
5. Asynchronous Input/Output
6. Filter Requirements for SecureNAT Clients
7. Filter Requirements for Firewall Clients
8. Setting Filter Priorities
9. Application Filter Objects
10. Filter Object Model
11. Filter Alert Events