1872080 - Error connecting to Database

Log file IntroscopeEnterpriseManager.log one or more of the errors described below:

[WARN] [CheckDatabase.Thread1] [Manager.com.timestock.tess.util.DbUtils] database inaccessible; will check later

[ERROR] [PO:AppMapAgentPO Mailman 2] [Apm.Data.Model] [ Method : saveAllEdges, RootCause : A ResourcePool could not acquire a resource from its primary factory or source., Error Message : Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.GenericJDBCException: Cannot open connection]

[ERROR] [PO:AppMapAgentPO Mailman 2] [Manager.AppMapSubsystem] Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.GenericJDBCException: Cannot open connection 

[ERROR] [PO:AppMapAgentPO Mailman 1] [Apm.Data.Model] [ Method : saveAllEdges, RootCause : A ResourcePool could not acquire a resource from its primary factory or source., Error Message : Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.GenericJDBCException: Cannot open connection]

[ERROR] [PO:AppMapAgentPO Mailman 1] [Apm.Data.Model] [ Method : saveAllEdges, RootCause : A ResourcePool could not acquire a resource from its primary factory or source., Error Message : Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.GenericJDBCException: Cannot open connection]

[ERROR] [PO:AppMapAgentPO Mailman 1] [Manager.AppMapSubsystem] Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.GenericJDBCException: Cannot open connection 

wily em error connecting database , KBA , XX-PART-WILY , Introscope by CA Technologies , Problem