CA PC Data Source was configured to use the standby IP Address (EventManager@10.138.16.72).
The CA PC machine has two IP addresses:
eth3 10.126.14.53 (main IP address)
eth4 10.138.16.72 (standby IP address)
That is the reason the CA Spectrum (OneClick host) cannot send post via Web Services.
In the Tomcat log file, the following message was found:
set 04, 2017 11:48:30 AM (PoolThread-3: GlobalPool => RubiconEventPoller) (org.apache.axis2.transport.http.impl.httpclient3.HTTPSenderImpl) - (INFO) - Unable to sendViaPost to url[http://10.138.16.72:8281/EventManager/EventManagerWS.asmx]
java.net.ConnectException: Connection timed out: connect