If the main proces accept the remote connection, the configuration as below will fail to reboot the apache process.
<IfModule mpm_winnt_module>
ThreadsPerChild 150
MaxConnectionsPerChild 100
</IfModule>
So, when the max connection(the connection was accepted by the main process) reached, Apache will not restart, and any other client can not access the Apache web server.
Hope to find a solution. Thank you.
also i raise an issue on apachen bug database, below is the link