Found it! It's too simple. Log into Ambari as Admin. Go to the Services tab > Select HDFS from the action menu on the left > Click the Service Actions button on the top right > Hit Start. If you need to do it manually for whatever reason, Go to the host tab, click your Host's name (Hyperlink), then start the services in this order: 1.) SNameNode / HDFS 2.) DataNodes / HDFS 3.) NameNode / HDFS I was able to get access to the Files Viewer trying it both ways. Hope this helps!
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