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What's happen with this error?
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Posted by HoangJav@, 08-16-2009, 12:17 AM hello, My server i7 920 12GB Ram Cpanel CPU load average about 0,7% Ram Load average about 20% but service in httpd port very slow. and have errors Someone who know this error? And how to fix? Thank you
Posted by fabin, 08-16-2009, 01:43 AM Someone is trying to flood port 80. You may do the following... 1. Turn "Off" KeepAlive and lower Timeout parameter in apache configuration 2. Use mod_security in apache
Posted by supportexpertz, 08-16-2009, 03:32 AM You can make simple script to block hosts with more than some value of SYN_RECV requests using iptables. (get the IPs from the netstat command) .This may not be the best method , but for the things to get normal soon you can follow this . There are some options in sysctl that you can play with to get things work . But before that we must identify whether its a real ddos or a normal dos . If its a heavy attack as ddos , its better you contact your DC . Increase the backlog queue to support more connections in the half-open state. sysctl -w net.ipv4.tcp_max_syn_backlog="2048" Also tcp_synack_retries variable can be tweaked . Make your hosting company do these and some apache optimization can surely help .
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