Cannot Validate Cluster Clock Synchronization

Document ID : KB000127908
Last Modified Date : 25/02/2019
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Getting the following error message on the vApp dashboard under Provisioning Server and User Store components.
[ERROR] cannot validate cluster clock synchronization - host <IP Address> is unreachable

Cannot validate cluster clock synchronization - host is unreachable

When you login to the vApp and run the check_cluster_clock_sync command, it will hang.

vApp 14.x
This error is happening when there is mounted external network drive in the vApp that is not accessible anymore.
Login to the vApp node which the IP address is shown in the error message and run 'mount -l' and identify the unreachable network drive. Unmount the network drive or fix the accessibility of the network drive.
Please refer to the following document for more information about mounting network drive on vApp
Administering Virtual Appliance (refer to Mounting Network Drives section)
Additional Information:
How to Mount and Unmount Filesystem in Linux