When you run the following error through Google…

org.apache.jk.common.ChannelSocket processConnection
WARNING: processCallbacks status 2

The first result is totally useless, but does point you to the third result, which states…

When using AJP, this problem is caused by a request coming from the httpd (apache) server
to tomcat, but the apache server is stopped from listening for the response from the tomcat
server. Usually this is caused by a user clicking on a new link before tomcat has a chance
to respond (fully), so apache has moved on - but tomcat doesn't know about it.

It can be safely ignored.