c# qr code generator source Estimated lesson time: 30 minutes in Visual C#.NET

Drawing QR Code ISO/IEC18004 in Visual C#.NET Estimated lesson time: 30 minutes

Estimated lesson time: 30 minutes
Generating QR Code ISO/IEC18004 In C#
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What Are Application Filters
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Application filters work with the firewall service in ISA Server to intercept and process network packets as they pass through ISA Server. Application filters examine the application-level data within those packets and then filter the packets based on firewall rules. ISA Server application filters are implemented as Component Object Model (COM) server dynamic link libraries (DLLs) that run in the same process space as the firewall service. When the firewall service starts, all application filters that are registered with the firewall service are also loaded. Application filters are add-ons to the firewall service. When a packet arrives, the firewall service uses firewall rules defined in the rules engine to check the packet. One check is to see if an application filter is associated with the protocol used by the packet. If there is, the firewall service passes the packet to the application filter for further inspection. An application filter can perform protocol- or system-specific tasks such as authentication and checking for viruses.
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Lesson 5
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Implementing Application and Web Filtering
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See Also
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To view all the application filters included with ISA Server 2004, open the ISA Server Management Console, expand Configuration, and then click Add-ins. The application filters are listed on the Application Filters tab. You can enable or disable the Web filters from this interface, but most applications filters cannot be modified.
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Application filters can be used in several different ways on ISA Server, including:
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Enabling firewall traversal for complex protocols Application filters can extend the ability of ISA Server to handle complicated protocols that require more than a single TCP connection. Some applications, such as FTP or media streaming applications, initiate a connection with a server using a specified port number. However, once the initial connection has been established, the server and client negotiate one or more dynamic ports that will be used for further communications. An application filter can enable the firewall traversal of these protocols. ISA Server uses the application filter to track the negotiation between the client and server as they determine the secondary connections, and then ISA Server can dynamically configure the ports required for the secondary connections. An example of such a filter is the built-in FTP application filter that handles all aspects of configuring a firewall to automatically allow a secondary FTP data channel. The FTP filter can also be modified to control whether users can download and upload files using FTP. By default, the FTP filter only allows users to download files. Enabling protocol-level intrusion detection Application filters can examine the contents of application packets to check for protocol-level intrusion detection. A common example of this type of filtering is based on filtering commands to protect against buffer overflow attempts. ISA Server provides POP3, SMTP, and DNS application filters that provide this type of functionality. Enabling protocol-level content filtering Application filters can parse highlevel application protocols, look for actual data (the payload), and apply rules and processing based on the content. For example, you can use the feature to provide protocol-level syntax validation, antivirus scanning on file transfers, or scans of the content based on defined strings. The SMTP filter provided with ISA Server is an example of these types of application filters. Generating alerts and log events Application filters can also be used to create alerts and log events based on the activity discovered by the application filter. For example, if a DNS application filter detects repeated attack attempts, the filter can create an alert or log the information.
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Configuring ISA Server as a Firewall
Note Many third-party vendors use application filters to implement features such as content filtering, access control, specialized authentication methods, and intrusion detection. For a listing of many of the third-party products that are compatible with ISA Server, see http:// www.isaserver.org and the Partners Web site at http://www.microsoft.com/isaserver/partners.
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