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I'm running Wordpress website with Nginx and Memcached. I have simple DNS round robin balancing with A records pointing to both web servers. I've noticed the following entries in both web servers access logs: - [07/Jun/2012:22:43:58 +0100] "-" 400 0 "-" "-" - 0.000 - [07/Jun/2012:22:43:58 +0100] "-" 400 0 "-" "-" - 0.000 - [07/Jun/2012:22:43:58 +0100] "-" 400 0 "-" "-" - 0.000 - [07/Jun/2012:22:43:58 +0100] "-" 400 0 "-" "-" - 0.000 - [07/Jun/2012:22:43:58 +0100] "-" 400 0 "-" "-" - 0.000

I've configured W3 Total cache plugin for Wordpress - pointing to loopback address ( on each Wordpress installation.

Is this because the webserver is trying to access content that is cached on the other web server? Shall I add IPs to W3 plugin of both web servers on each website (192.168.1.:11211, I'm not sure if this related to Memcached or maybe some configuration issue on the server itself?


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up vote 1 down vote accepted

These errors are "400 Bad Request", most likely just client connects without sending anything. Some load balancers / health checks known to cause a lots of these.

Also Google Chrome opens a lot of connections just in case, but may not use all of them.

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Thanks. I think it was actually caused by Google Chrome. – HTF Jun 8 '12 at 18:36

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