In the /var/log/vsfwd.log file on the ESXi host, you see entries similar to:
2015-06-16T22:35:04Z vsfwd: [ERROR] Failed to log on to broker X.X.X.X:5671: Logging in: Input/output error
In the /home/secureall/secureall/logs/vsm.log file on the vShield/NSX Manager, you see entries similar to:
2015-06-16 22:48:57.535 GMT ERROR HeartbeatManagerHeartbeatTimer HeartbeatManager$HeartbeatTask:297 - Client has not responded to the heartbeat for longer than the alert threshold. Peer name = 'com.vmware.vshield.userworld', client token = 'host-1837', client id = 'xxxxx-xxxx-xxxx-xxxx-xxxxxxxx', last heartbeat response = '20557', last published heartbeat = '23507'
Note: The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.
Environment
VMware NSX for vSphere 6.1.x VMware NSX for vSphere 6.0.x
Cause
This issue occurs when one or more ESXi hosts netcpa module fail to establish a connection with the NSX Manager RMQ server which is a connection that handles all management operations.