[ubuntu] Ubuntu Server slow down and freezes

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http://ubuntuforums.org – Hi, i have a big problem: Ubuntu Server 10.04 without reason slow down and freezes. When is it in freeze i can ping it, but with a big latency, but i can't connect ftp shh and can't load a webpages. On this server i have installed wordpress and prestashop. I want understand what is the problem that causes the freeze of this webserver: From apache2 error.log i see in the moment of the freeze this error: Code: [Tue Jun 05 16:28:07 2012] [error] [client] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:) (Hardware)