I'm using mod_proxy or mod_cluster and seeing "APR does not understand this error code: proxy: read response failed from"

Issue

• I'm using mod_proxy and seeing "APR does not understand this error code: proxy: read response failed from" in the Apache error_log

        [error] (120006)APR does not understand this error code: proxy: read response failed from 10.10.102
        [error] (104)Connection reset by peer: ajp_ilink_receive() can't receive header
        [error] ajp_read_header: ajp_ilink_receive failed

• telnet testing from the apache proxy servers to the jboss profiles showed connections being intermittently being refused by the jboss profiles getting ERROR:

[error] ajp_read_header: ajp_ilink_receive failed
 [error] (120006)APR does not understand this error code: proxy: read response failed from (null) (vicpjbapp04.reecenet.org)
 [error] ajp_read_header: ajp_ilink_receive failed