SAP Business One Integration Solution Registration Fails on CCC

When registering the Integration Server with the B1 Cloud Center the registation fails and the message below is logged.

logon to B1OD SLD failed: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable tofindvalid certification path torequestedtarget

Has anyone encountered this and how did you resolve the issue?