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SECURING WEB SERVER 7.0 generate, create code 128 code set b none for .net projects Java Reporting Library-Jasper Reports The following dire .net vs 2010 Code 128 Code Set A ctive provides an example of how to use these parameters within the check-request-limits SAF to limit clients to a maximum of 10 requests per second:. PathCheck fn= check-request-limits monitor= $ip max-rps= 10 This is a general barcode 128 for .NET directive that can be used to keep track of requests from any client IP address; this is accomplished through the use of the monitor attribute. The monitor attribute speci es the name of the counter or bucket used to maintain the number of requests per second.

Specifying a variable of $ip for this value enables you to maintain individual counters for each client IP address. The interval, continue, and error values are not explicitly stated; therefore the server will use the default values of 30, threshold, and 503 for these attributes, respectively. You can limit request tracking to a particular type of request through the use of conditional processing as follows:.

<If path = *.pl > PathCheck fn= check-request-limits monitor= $ip max-rps= 10 </If> This example demon .net framework USS Code 128 strates the use of the <IF> container to limit monitoring to PERL requests only. If a particular client attempts to process more than ten PERL requests (of any kind) within 30 seconds, then the next request is not serviced.

Instead, the client is met with an error 503 (Service Unavailable). You see this error in the access log for any client requests where the limit has been exceeded. You can use the command line interface to enable and con gure request processing limits for a particular virtual server with the enable-request-limits subcommand as follows:.

enable-request-lim its --max-rps=10 --monitor-attribute= \$ip --con --vs=www. This adds the foll code 128b for .NET owing directive to the object con guration le:. PathCheck fn= check-request-limits max-rps= 10 monitor= $ip 8.4 DETECTING AND RESPONDING TO DENIAL-OF-SERVICE (DOS) ATTACKS Warning: You must use the backslash (\) character when con guring the monitor attribute to use a variable such as $ip. This is required to escape the dollar sign and tell the Web Server to use the next character as is..

The Administration .NET ANSI/AIM Code 128 Console also allows you to enable and con gure request processing limits as well from the Virtual Server Request Limits page. You can nd this page by navigating as follows: Con gurations, con g_name, Virtual Servers, virtual_server_name.

. 8.4.2 Monopolizing Server Connections Clients utilize ap .net framework Code 128 Code Set B plication threads during request processing. The Web Server maintains a pool of acceptor threads that accept the client request and worker threads that perform request processing.

Threads are returned to the pool after the request has been completed and the server has provided a response to the client.. Note: See 2, Web Server 7.0 Architecture, for more information on Web Server threads. One client can ope .NET code 128c n several connections to a Web Server and therefore take up multiple threads. That same client can provide requests in an intentionally slow manner and therefore hang on to threads longer than they should.

Either of these two conditions can cause the thread pool to become depleted and additional requests cannot be processed. The check-request-limits SAF can be used to specify a maximum number of client connections, but it cannot be used to address intentionally slow request processing. Previous versions of the Web Server enabled you to specify the number of seconds that the server waited for data to arrive from the client before closing the connection.

This was con gured with the AcceptTimeout directive in the magnus. conf le and was set to 30 seconds by default..

Note: The AcceptTi meout directive is now speci ed by the io-timeout element in the server.xml le and continues to have a default value of 30 seconds. You can observe the behavior of this element by using the TELNET command to connect to the Web Server on the appropriate port (for instance, TELNET www. 80). The Web Server terminates the connection after 30 seconds if it does not see a request from the client.

. SECURING WEB SERVER 7.0 This parameter is adequate in many cases, but it does not provide granular control throughout the entire request process. After the client makes an initial request of the server, the io-timeout setting no longer applies and the client is free to monopolize server connections. To address the need for granularity, Web Server 7.

0 now includes two additional timeout attributes:. request-header-tim VS .NET code-128c eout Maximum time (in seconds) that the Web Server waits for the complete HTTP request header. 2.

request-body-timeout Maximum time (in seconds) that the Web Server waits for the complete HTTP request body.. Possible values fo r both attributes include 0 604800 seconds (which equates to 0 10,080 minutes or 0 168 days) and 1 (which disables the timer). The timers are disabled by default, but you can enable them as you determine necessary. For instance, if you want to ensure that all request headers are received within the rst 10 minutes of the connection followed by all request body data within the next 60 minutes, you can set the request-header-timeout and request-body-timeout values to 600 and 3600, respectively.

All connections that take longer than these two values are disconnected by the server automatically. The CLI subcommand to accomplish this task is set-http-prop and can be used to specify these values as follows:.
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