Unable to see cdh_cluster Stale Configurations

I'm getting the exception attached in the file(CDH_5.txt).
When I try to view the cdh5_cluster stale configuration when one of my service hdfs was down, i got the exception.
Not sure about that, but in my logs i could see the jdbc connection exception, but i've verified the cloudera manager db and it is accessible.

Can someone look into this issue or point me to a workaround if anything exists