Using server name in URL a Bad Gateway server error is found. Clarity server just upgraded from 15.8.0 to 15.9.2. Replacing the previous Tomcat webserver directory seems to work.
Error Bad Gateway : The proxy server received an invalid response from an upstream server.
Clarity 15.9.2
Network restrictions needed custom connector port settings in the server.xml (Clarity Tomcat directory >/conf directory and open the server.xml file)