you shouldnt have that many connections, maybe 30 at the most per user and that is still high. Make sure KeepAlive is on in httpd.conf. I know I had seeen a friends server once where he had this off and it would let connections build up
please also tell me where i can set a maximum number of connections per IP on a apache server because server people saying there is no such thing. You have to install a anti-ddos script then you can setup and more connections from any IP will be block.