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https://issues.apache.org/jira/browse/NIFI-1735?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Handermann resolved NIFI-1735.
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Resolution: Abandoned
> Confusing messages in app log when DNS issues occur on a system with a NCM
> --------------------------------------------------------------------------
>
> Key: NIFI-1735
> URL: https://issues.apache.org/jira/browse/NIFI-1735
> Project: Apache NiFi
> Issue Type: Bug
> Reporter: Wynner
> Priority: Minor
>
> When a system running with a NCM instance of NiFi has DNS issues, the logging
> is confusing to the user and leads the user to believe there is a firewall
> issue.
> INFO [Process Pending Heartbeats] o.a.n.c.manager.impl.WebClusterManager Node
> Event: [id=xxx, apiAddress=hostname, apiPort=port, socketAddress=hostname,
> socketPort=port] -- 'Firewall blocked received heartbeat. Issuing
> disconnection request.'
> INFO [Process Pending Heartbeats] o.a.n.c.manager.impl.WebClusterManager Node
> Event: [id=xxx, apiAddress=hostname, apiPort=port, socketAddress=hostname,
> socketPort=port] -- 'Disconnection requested due to Blocked By Firewall'
> ERROR [Process Pending Heartbeats] o.a.n.c.manager.impl.WebClusterManager
> Failed to process heartbeat from hostname:port due to
> org.apache.nifi.cluster.protocol.ProtocolException: Failed to create socket
> due to: java.net.UnknownHostException: hostname
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