Problem with Apache2.4 - wrong message size and additional errors

Hello experts,
I am having a problem with Apache 2.4:

[Wed Mar 07 08:04:42 2018] [10868:11636] [error] ajp_connection_tcp_get_message::jk_ajp_common.c (1412): (ajp13w) wrong message size 27714 8192 from
[Wed Mar 07 08:04:42 2018] [10868:11636] [error] ajp_get_reply::jk_ajp_common.c (2289): (ajp13w) Tomcat is down or network problems. Part of the response has already been sent to the client
[Wed Mar 07 08:04:42 2018] [10868:11636] [error] ajp_service::jk_ajp_common.c (2771): (ajp13w) sending request to tomcat failed (unrecoverable), because of protocol error (attempt=1)

This error messages are constantly repeating and we have tried to optimize it by putting parameters into Apache24

Also we have put this into Tomcat 8:
<Connector port="8009" tomcatAuthentication="false" protocol="AJP/1.3" redirectPort="8443" packetSize="65536" minSpareThreads="50"  maxThreads="400" connectionTimeout="60000" acceptorThreadCount="2" />

This is SSO WebTier and it has a lot of customers accessing it around (100) at the time.


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