NSX not connected compute managers due to time difference between them is more than 60 seconds

Products

• VMware NSX

Issue/Introduction

• VCF upgrade pre-check has error: NSX not connected compute managers. Error Description: Check if there are any not connected compute managers
• Access NSX UI -- System -- Fabric -- Compute Managers, the compute manager Connection Status is "Down".
• Reconnect this compute manager, failed with error: 
  The time set on Compute Manager x.x.x.x is ahead of/earlier than the time set on NSX by xx seconds. Update the time on Compute Manager or NSX so that the difference between them is less than 60 seconds and try again. (Error code: 90008). 

Environment

VMware NSX

Cause

Time difference between vCenter server and NSX manager is more than 60 seconds.

Resolution

1. Use user 'root' to ssh to vCenter server and also all nsx manager nodes. Run command 'date' to check their time.
2. Correct time using NTP service, or update time use command 'date -s hh:mm:ss'.
3. Reconnect compute manager.
4. Proceed with the VCF upgrade.