Solr Configuration Problem on Demo Instance

Unable to build Solr Index on demo-trunk and demo-stable instances.
 
Demo Trunk: Getting connection error while running rebuildSolrIndex service from webtools on demo-trunk instance. Below is the error message-
 

org.apache.http.conn.HttpHostConnectException: Connect to localhost:8443 [localhost/127.0.0.1] failed: Connection refused (Connection refused)

 
Demo Stable: I also tried running the same service from webtools on demo-stable instance and getting below error-
 
 

javax.net.ssl.SSLPeerUnverifiedException: Host name 'localhost' does not match the certificate subject provided by the peer (CN=demo-old.ofbiz.apache.org). Please find the attached screenshots for the same.

 
 
It seems like some configurations are missing for solr plugins on these demo instances.
Please find attached the error logs from demo-trunk instance as shared by jleroux. Thanks Jacques for providing the error logs from the instance.