It appears like the SOLR service which provides the searching capability for all Devtest Broker-related operations may be down or Port 1508 might not be open. It may be blocked. Opening the Port 1508 should resolve the issue.
Open a browser and type in the URL : http://<DevTest Broker Hostname>:1508/solrservice/ in a browser window. If everything is fine, you should see the webpage load as shown below:
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