We are running CDH 5.3.3 with Hue 3.7.0, and just added impala via Cloudera Manager. Whenever we log on to Hue, the "No available Impalad to send queries to." appears. Cloudera Manager doesn't report anything wrong with either impala or Hue. The impala and Hue logs don't show any errors. 

Any help would be greatly appreciated.

Thanks!

For completeness, I also want to add that the impala-shell works without a problem. The issue seems to be restricted to Hue.