https://community.cloudera.com/t5/Support-Questions/Got-500-Error-when-trying-to-view-status-of-a-running/m-p/29651#M40436 <P>A&nbsp;container log is not part of the yarn service logs and will not be affected by any of the yarn settings. The container log looks like a log from an AM and that means that you most likely are looking at a problem of the AM web UI not being able to bind.</P><P>The AM web ui will bind to an&nbsp;ephemeral port which can not be limited to a set of ports. Make sure that you allow binding to any port on the NM's from your security groups in AWS.</P><P>&nbsp;</P><P>Wilfred</P> Thu, 16 Jul 2015 05:18:54 GMT Wilfred 2015-07-16T05:18:54Z