All our hosts are reporting warnings and we see an error on all our hosts in Cloudera Manager:
This host is in contact with Cloudera Manager. The host's Cloudera Manager Agent's software version can not be determined.
The hosts are reporting in regularly and HDFS and other services are running as expected. How can I clear this error? Any suggestions?
I have seen this with CM 5.3.x and earlier releases not working with unsupported OSes like Red Hat 6.6. Please check the release notes to see if your problem falls in this category
Another reason for this error is that the server and agent can't pass on large messages.
Both the hosts and the switch must be capable to pass on messages larger than 1500.
To elliminate network configuration errors try this command.
ping -c 3 -s 1800 <remote-host>