3408975 - Error: "unable to find valid certification path to requested target Context" while connecting DP agent to SAP Integrated Business Planning - SAP HANA Smart Data Integration

• DP agent connection to SAP Integrated Business Planning(IBP) is working before but failed suddenly
• See the following error when check agent status from DP agent configuration tool
  "com.sap.hana.dp.adapter.sdk.AdapterException: Failed to connect to xs server: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target Context: com.sap.hana.dp.adapter.sdk.AdapterException: Failed to connect to xs server: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
          at com.sap.hana.dp.adapter.framework.cloud.CloudService.start(CloudService.java:117)
          at com.sap.hana.dp.adapter.framework.core.ServiceThread.run(ServiceThread.java:32)
          at java.lang.Thread.run(Thread.java:805)"

SAP HANA Smart Data Integration
SAP Integrated Business Planning

DP Agent, SDI, IBP, agent connection, certificate , KBA , HAN-DP-SDI , SAP HANA smart data integration (SDI) , Problem