The EM log contains repeated INFO level message:
[INFO] [Thread-ClusterTopologyPoller] [Manager.AppMap] Cannot send EM topology due: 'SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target' Will retry.
Data visibility under Team Center Map layers "APM Infrastructure Layer" & "Infrastructure Layer" will also likely be impacted.
This message occurs when the 10.7 EM Web Server is configured to use the secure connector enabled in the em-jetty-config.xml file.
When the Introscope_Enterprise_Manager.lax or EMService.conf file is configured to add JSSE tracing property "-Djavax.net.debug=all" the EM log shows a "certificate_unknown" for the SSL handshake every 10 seconds.
In 10.7 there is new functionality to make the EM behave like an http-client to the same/another EM and the security is more strict i.e. when a secure EM web server is being used an invalid/untrusted certificate will cause the error.