Thanks Peter for your answer . you said :
> You *can never* see these errors in Tomcat, because Tomcat is never 
> aware that the connection was received.  The operating system's 
> TCP/IP stack has received the incoming SYN, tried to queue the 
> connection request on Tomcat's accept queue, failed, and simply 
> sends a RST to close the connection.

What do these jargons SYN and RST actually mean ?  I do not know TCP IP 
details . 

Regards,

Subhrajyoti 
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Peter Crowther <[EMAIL PROTECTED]> wrote on 10/17/2008 06:45:13 
PM:

> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> > "If still more simultaneous requests are received, they are
> > stacked up inside the server socket created by the Connector,
> > up to the
> > configured maximum (the value of the acceptCount attribute.
> > Any further
> > simultaneous requests will receive "connection refused" errors, until
> > resources are available to process them. "  So where can we
> > expect to see those errors in Tomcat?
> 
> You *can never* see these errors in Tomcat, because Tomcat is never 
> aware that the connection was received.  The operating system's 
> TCP/IP stack has received the incoming SYN, tried to queue the 
> connection request on Tomcat's accept queue, failed, and simply 
> sends a RST to close the connection.
> 
> You *might* be able to monitor the total number of connection 
> refusals at the OS level.  Netstat on Windows will give you this, 
> for example, though it combines refusals due to load and refusals 
> due to no port being configured to accept a connection.
> 
>                 - Peter
> 
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