Load balancer health check of EEM causes EEM UI access problems

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Article ID: 76641

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Updated On:

Products

CA Application Performance Management Agent (APM / Wily / Introscope) INTROSCOPE

Issue/Introduction

Our load balancers send an HTTP request string to EEM with an interval of 5 seconds and check whether the HTTP receive string matches the string defined by us or it returns a HTTP code which indicates an error/health problem. 
The HTTP request string is: GET /spin/eiam/eiam.csp HTTP/1.1\r\nHost: ApmEem\r\nConnection: Close\r\n\r\n 
The receive string defined by us is: CA Embedded Entitlements Manager 
We found that there are so many CLOSE_WAIT sockets from our load balancers that it causes the EEM UI to be non-responsive i.e. the main EEM page keeps reloading after it is opened.

Cause

The root cause was found to be too frequent access of the EEM page from the load balancer.

Environment

Release: CEMUGD00200-9.7-Introscope to CA Application-Performance Management-Upgrade Main
Component:

Resolution

After changing the EEM page request interval to be greater than 8 seconds and timeout to be greater than 25 seconds, the EEM page loading problem was resolved.