Request Failed. Exception Sun.security.validator.validatorexception Sap Download Manager ((top))

In enterprise software procurement and maintenance, the SAP Download Manager (SDM) serves as a critical bridge between SAP’s Software Distribution Center and a customer’s local environment. However, users occasionally encounter a cryptic error:

The sun.security.validator.ValidatorException is thrown by Java’s PKIX validator when an X.509 certificate chain cannot be verified. Common sub-reasons include: In enterprise software procurement and maintenance, the SAP