Apache does allow the administrators to limit the amount of requests that are to arrive at the server during any stage of the server run. The keyword MaxClients limits the number of simultaneous requests on to the webserver, by limiting this value the server will prevent the amount of requests and will not create any further requests once the limit is reached.
We can update the limit of 256 clients, for this one must edit the HARD_SERVER_LIMIT entry in httpd.h and recompile Apache.
For the current settings, for all those connections that are to exceed the maxclients limit will be queued up by the kernel as mentioned in the directive: ListenBackLog. This helps back at times when the process is free the server will be able to grant the request.
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