Calculo das threads do apache

MaxClients ≈ (RAM - size_all_other_processes)/(size_apache_process)

MaxClients / ThreadsPerChild < ServerLimit 




Fonte
http://www.devside.net/articles/apache-performance-tuning
http://httpd.apache.org/docs/2.2/mod/worker.html

Habilitar e desabilitar icmp no windows server

Go to Start >> Administrative Tools >> Windows Firewall with advanced security >> Inbound Rules >> File and Printer Sharing (Echo Request - ICMPv4-IN) >> right click and select Enable Rule. 

fonte:

http://www.dotnetfunda.com/codes/code501-how-to-enable-or-disable-ping-in-windows-server-2008-r2-server.aspx