AFAIR, it is not a problem (idle connection timeout). The fact it's logged at INFO level is unfortunate.
I try to put a value in the jk2.properties file :
channelSocket.soTimeout = 3000000
channelSocket.soTimeout = -1
But nothing changes :(
There is no documentation about this attribute :(
If you don't need a connectionTimeout, You can discard those messages by setting connectionTimeout to "0" in jbossweb-tomcat41.sar/META-INF/jboss-service.xml.