The APM 10.0 and 10.1 em-jetty-config.xml file has a new "certAlias" property to force the use of a keystore certificate alias which is different from the default alias of 'wily'? i.e. the default entry has:
<Set name="certAlias">wily</Set>
However the "certAlias" property is missing from the webview-jetty-config.xml file.
Manually add the "certAlias" property to the webview-jetty-config.xml.