[Debug]"FastCGI process exceeded configured activity timeout" error

Edit %WINDIR%\system32\inetsrv\fcgiext.ini


[Types]

…

php=PHP

…

[PHP]

ExePath=C:\Program Files (x86)\PHP\php-cgi.exe



under ExePath=C:\Program Files (x86)\PHP\php-cgi.exe,
add the following:

InstanceMaxRequests=10000
ActivityTimeout=600
RequestTimeout=600

reference :
http://forums.zend.com/viewtopic.php?f=8&t=273
http://forums.kayako.com/threads/support-desk-not-responding-after-sending-attachments.26719/