Question & Answer
Question
My z/OS Connect EE is running v2.0.0.5 with Liberty 16.0.0.2. We are evaluating the product and are experiencing veyr high CPU utilization within the zCEE server when we begin stress testing with https persistent connection requests.
Could this be related to our security configuration?
Answer
To determine if the additional CPU utilization is related to your security configuration, consider enabling diagnostic tracing in your zCEE server as follows:
Set traces in zCEE :
server.env file (jvm options)
add: -Djavax.net.debug=true- server.xml file
add: <loggingtraceSpecification="SSL=all:SSLChannel=all"/>
As the trace could be very large, send few requests (2 to 5) to zCEE without persisting connection.
Remove the settings in the server.env and server.xml
The trace is written in the logs/trace.log file: - To find the cipher suite, search: "O Cipher Suite:" - To check wether it's FULL or NULL hanshake, on the 2nd request (as the 1st is FULL handshake), search: "O %% Resuming" If not found, it is because the client did not reuse the TLS Session ID, and therefore it will perform a FULL Handshake each time using additional CPU.
Product Synonym
zCEE
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Document Information
Modified date:
14 February 2023
UID
dwa1394306