Hi List. 
In and around last windows updates for our WIN2019 box, our tomcat connector 
start to fail with the below error message. 
Setup is IIS 10->ISAPI connector => Tomcat 9 -> 
https://tomcat.apache.org/connectors-doc/webserver_howto/iis.html 
Has someone seen this behaivor? 
To be able to open the system I am bypassing the connector and listening in 
port 443 in server.xml directly. 



[Wed Mar 22 15:08:46.746 2023] [10780:14112] [error] 
ajp_connection_tcp_get_message::jk_ajp_common.c (1408): (tomcat01) wrong 
message size 18441 8192 from ::1:8009 
[Wed Mar 22 15:08:46.751 2023] [10780:14112] [error] 
ajp_get_reply::jk_ajp_common.c (2285): (tomcat01) Tomcat is down or network 
problems. Part of the response has already been sent to the client 
[Wed Mar 22 15:08:46.753 2023] [10780:14112] [info] 
ajp_service::jk_ajp_common.c (2774): (tomcat01) sending request to tomcat 
failed (recoverable), because of protocol error (attempt=1) 
[Wed Mar 22 15:08:46.860 2023] [10780:14112] [error] 
ajp_connection_tcp_get_message::jk_ajp_common.c (1408): (tomcat01) wrong 
message size 18441 8192 from ::1:8009 
[Wed Mar 22 15:08:46.865 2023] [10780:14112] [error] 
ajp_get_reply::jk_ajp_common.c (2285): (tomcat01) Tomcat is down or network 
problems. Part of the response has already been sent to the client 
[Wed Mar 22 15:08:46.868 2023] [10780:14112] [info] 
ajp_service::jk_ajp_common.c (2774): (tomcat01) sending request to tomcat 
failed (recoverable), because of protocol error (attempt=2) 
[Wed Mar 22 15:08:46.871 2023] [10780:14112] [error] 
ajp_service::jk_ajp_common.c (2795): (tomcat01) connecting to tomcat failed 
(rc=-11, errors=1, client_errors=0). 
[Wed Mar 22 15:08:46.873 2023] [10780:14112] [error] 
HttpExtensionProc::jk_isapi_plugin.c (2123): service() failed with http error 
502 

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