You have a mismatch between this attribute on the workers:

max_packet_size

It isn't set so the default of 8192 is used.

And this attribute on the AJP connector:

packetSize="65536"

Those attributes need to match on all workers and the AJP connector.

Mark



On 23/03/2023 18:19, Luis Ramos wrote:
Hi,
worker.list=tomcat01,tomcat02
worker.tomcat01.type=ajp13
worker.tomcat01.host=::1
worker.tomcat01.port=8009
worker.tomcat01.secret=namnetiq1
worker.tomcat01.ping_timeout=1000
worker.tomcat01.connect_timeout=10000
worker.tomcat01.prepost_timeout=10000
worker.tomcat01.socket_timeout=10
worker.tomcat01.connection_pool_timeout=60
worker.tomcat01.connection_pool_size=90
worker.tomcat01.retries=2
worker.tomcat01.reply_timeout=300000

worker.tomcat02.type=ajp13
worker.tomcat02.host=::1
worker.tomcat02.port=8009
worker.tomcat02.secret=namnetiq1
worker.tomcat02.ping_timeout=1000
worker.tomcat02.connect_timeout=10000
worker.tomcat02.prepost_timeout=10000
worker.tomcat02.socket_timeout=10
worker.tomcat02.connection_pool_timeout=60
worker.tomcat02.connection_pool_size=90
worker.tomcat02.retries=2
worker.tomcat02.reply_timeout=300000

Luis J Ramos
CNT Infotech Corp. (www.cntinfotech.com)
646.452.9349

----- Original Message -----
From: "Mark Thomas" <ma...@apache.org>
To: "users" <users@tomcat.apache.org>
Sent: Thursday, March 23, 2023 12:51:59 PM
Subject: Re: service() failed with http error 502

And the workers.properties file?

Mark


On 23/03/2023 16:13, Luis Ramos wrote:
Hi
   Apache Tomcat/9.0.65
from server.xml

    <Connector protocol="AJP/1.3"
                 address="::1"
                 port="8009"
                 maxThreads="3000"
                 minSpareThreads="50"
                 connectionTimeout="121000"
               packetSize="65536"
               secretRequired="true" secret="namnetiq1"/>
Luis J Ramos
CNT Infotech Corp. (www.cntinfotech.com)
646.452.9349

----- Original Message -----
From: "Mark Thomas" <ma...@apache.org>
To: "users" <users@tomcat.apache.org>
Sent: Thursday, March 23, 2023 4:09:41 AM
Subject: Re: service() failed with http error 502

On 22/03/2023 19:20, Luis Ramos wrote:
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.

What Tomcat version are you using?

Has there been any change in Tomcat version in the same time frame? If
so, please provide exact version information.

Please provide the AJP connector configuration from Tomcat's server.xml

[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

This suggests that Tomcat is configured with a different maximum AJP
message size than IIS.

Please provide your workers.properties file.

Mark

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