BasicScmProxy: Exception while getting fetch configDefaults hash

[#1]

2016-01-12 13:24:58,093 INFO com.cloudera.cmon.firehose.CMONConfiguration: Config: file:/var/run/cloudera-scm-agent/process/788-cloudera-mgmt-ACTIVITYMONITOR/cmon.conf
2016-01-12 13:25:00,933 INFO com.cloudera.cmf.cdhclient.util.CDHUrlClassLoader: Detected that this program is running in a JAVA 1.7.0_67 JVM. CDH5 jars will be loaded from:lib/cdh5
2016-01-12 13:25:00,935 INFO com.cloudera.enterprise.ssl.SSLFactory: Using default java truststore for verification of server certificates in HTTPS communication.
2016-01-12 13:25:01,435 WARN com.cloudera.cmf.BasicScmProxy: Exception while getting fetch configDefaults hash: none
java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)

I am seeing this error after upgrading from CDH 5.3.3 to CDH 5.5.1.

I was able to start the cluster no problem. It seems Cloudera Manager is not able to query any services to capture service state, logs, etc.

Any ideas?

[#2 · Accepted solution]

Not sure what happened. Restart of entire cluster failed to fix the issue, however by restarting individual cluster management services, the problem resolved itself and it is currently looking good.