Expected Isengard v1 protocol instead of version -1

Document ID : KB000123738
Last Modified Date : 26/12/2018
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Issue:
The MOM went to above 400% capacity and the webview and workstation interfaces became unresponsive. In both cases the below error messages appeared in the MOM log.
[ERROR] [UnknownHub Hub Receive 1350] [Manager.Cluster] Closing incoming route connector due to unrecoverable error. java.io.IOException: Expected Isengard v1 protocol instead of version -1
[ERROR] [UnknownHub Hub Receive 580] [Manager.Cluster] Closing incoming route connector due to unrecoverable error. java.io.IOException: Expected Isengard v1 protocol instead of version -1 
Resolution:
Set the query clamps on MOM and all Collectors:
introscope.enterprisemanager.query.datapointlimit=1000000
introscope.enterprisemanager.query.returneddatapointlimit=100000