We are using a CA-signed certificate for portal but recently another company acquired the company that authorized our web address and now there are some updates made to the certificate. As per the technical team who issues the certificates "All existing certificates will remain active and trusted until the end of their validity period" but we are experiencing the following issue:
System.CalloutException: IO Exception: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Later, i was asked if anyone removed the root and intermediate certificates which i don't know how to. Did anyone experience similarissue and got it resolved somehow?