Cahit, 2010/4/13 cahit Eyigünlü <cahit.eyigunlu at gmail.com>: > My server returning an error sth. like swap = 0 then locking httpd and all Set up a monitoring tool like sar etc. or my favourite, nmon with capacity planning. Depending on what those 4k users are doing, you might be running out of RAM + swap space until the out-of-memory killer kicks in and frees up some space by killing some processes. You should be able to see that activity in the message logfile. -- Hakan (m1fcj) - http://www.hititgunesi.org