Jboss unreachable/ slow behind apache with ajp

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http://serverfault.com – I have an linux server running with a JBoss Instance with apache2. Apache2 will use AJP connection to reverse proxy to JBoss. I found these messages in the apache error.log: [error] (70007)The timeout specified has expired: ajp_ilink_receive() can't receive header [error] ajp_read_header: ajp_ilink_receive failed [error] (120006)APR does not understand this error code: proxy: read response failed from (hostname) [error] (111)Connection refused: proxy: AJP: attempt to connect to (hostname) failed [error] ap_proxy_connect_backend disabling worker for (hostname) [error (HowTos)