An execution server is showing as unreachable after configuring it to use SSL per the instructions given here: https://docops.ca.com/ca-release-automation/5-5-2/en/installation/ca-release-automation-communications-security/secure-communications#SecureCommunications-SecureManagementServertoExecutionServerCommunication
CA Release Automation 5.5.2
CA Release Automation Execution Server on Linux
A typo was made while specifying the jms.key.store property inside of the webapps/execution/WEB-INF/jms.properties file. If this is the cause for your execution server becoming unreachable then it can be confirmed by checking execution server logs - around the time of startup. For this cause, as there may be others, you will specifically find messages inside of the nolio_exec_all.log with the text:
Invocation of init method failed; nested exception is java.lang.RuntimeException: java.io.FileNotFoundException: class path resource [conf/custom-keyStore.jks] cannot be opened because it does not exist;
Going back over the instructions to configure the Execution Server to use SSL (in the URL above) we see that conf/customkeystore.jks is specified in two files:
In this case the webapps/execution/WEB-INF/jms.properties file was updated to use: jms.key.store=conf/custom-keyStore.jks (notice the upper case S in keyStore).
Confirm the cause described above applies to your situation. If so then update the webapps/execution/WEB-INF/jms.properties file to specify the correct file name for the jms.key.store (case sensitive on Linux). Then recycle the Execution Server service.