Hi,

The "Failed request to SCM: 302" message occurs when the Host Monitor attempts to communicate to Cloudera Manager but the session has expired.  The Host Monitor acts as a client that authenticates to SCM, so it is subject to session restrictions.

The error can be ignored as the Host Monitor will re-authenticate and we do see that in your case that occurs.

In fact, a code change to make the message an INFO message rather than ERROR is slated for Cloudera Manager 5.7.2 and 5.8.2.