high connection failure while stress testing Apache + FCGI echo

Hi, All,

I'm a first time user of FCGI on windows with Apache 2.0.52 HTTPD. I 
downloaded the FCGI dev kit (fcgi-2.4.0 ), compiled the echo-cpp demo 
app in the examples folder and successfully tested it with the browser 
after configuring Apache properly. But when I ran "ab" to benchmark 
the performance, I notice a high rate (about 10%) of request failure 
although the process time per request did impress me very much! 

Has anybody experienced the same problem? It would be greatly 
appreciated if anyone could shed some light on this 

- why this is happenning? 
- what need I do the solve this problem?

Thanks

Stewart

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