Cluster did not join - pods: jgroups-1-jj7hc, jgroups-1-lflc6 in timeout: 120000 ms

WARN  [org.jgroups.protocols.openshift.KUBE_PING] (ServerService Thread Pool -- 77) Problem getting Pod json from Kubernetes Client[masterUrl=https://172.30.0.1:443/api/v1, headers={}, connectTimeout=5000, readTimeout=30000, operationAttempts=3, operationSleep=1000, streamProvider=org.openshift.ping.common.stream.TokenStreamProvider@73d58664] for cluster [ee], namespace [eap72-tests-suite], labels [null]; encountered [java.lang.Exception: 3 attempt(s) with a 1000ms sleep to execute [OpenStream] failed. Last failure was [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]]