Post operation of API caused a failure of actions to proceed

HI All, we have an issue where few actions did not process and while digging the root servers application logs i see the api post operation failed:-1:

2020-08-16 08:08:15,595 DEBUG [PlanEngine] (rest.RestApiInterface:105) :: Evaluating relevance: [1 + 1]
2020-08-16 08:08:16,624 ERROR [PlanEngine] (exception.PlanProcessingErrorHandler:183) :: IZNENG201E A general error unrelated to a specific Automation Plan action has occurred - (1) retries remaining.
com.ibm.tivoli.iemfsa.planengine.exception.IemInteractionException: IZNENG145E Running the REST post operation “https://RootServer:52311/api/query” caused the error Connect to RootServer:52311 [RootServer/IP-RootServer] failed: Connection refused: connect.
at com.ibm.tivoli.iemfsa.planengine.iem.api.rest.RestApiInterface.executeRequest(RestApiInterface.java:938)
at com.ibm.tivoli.iemfsa.planengine.iem.api.rest.RestApiInterface.evaluateRelevance(RestApiInterface.java:116)
at com.ibm.tivoli.iemfsa.planengine.iem.api.rest.RestAccessChecker.performAPITests(RestAccessChecker.java:83)
at com.ibm.tivoli.iemfsa.planengine.iem.api.rest.RestAccessChecker.canPlanEngineContinue(RestAccessChecker.java:59)
at com.ibm.tivoli.iemfsa.planengine.core.PlanEngine.performStartupChecks(PlanEngine.java:252)
at com.ibm.tivoli.iemfsa.planengine.core.PlanEngine.run(PlanEngine.java:188)
Caused by: org.apache.http.conn.HttpHostConnectException: Connect to RootServer:52311 [RootServer/IP-RootServer] failed: Connection refused: connect

Would there be a way to check and remediate this issue. Please suggest.