The Cluster service failed to bring clustered service or application 'SQL Server (MSSQLSERVER)' completely online or offline SQL Server service restarted/stopped, which cause the production database down n find this errors in System log.


  ERROR5:The Cluster service failed to bring clustered service or
  application 'SQL Server (MSSQLSERVER)' completely online or offline.
  One or more resources may be in a failed state. This may impact the
  availability of the clustered service or application.
  
  ERROR4:Cluster resource 'SQL Network Name (tcsdb)' in clustered
  service or application 'SQL Server (MSSQLSERVER)' failed.
  
  ERROR3:Cluster network name resource 'SQL Network Name (tcsdb)' cannot
  be brought online. The computer object associated with the resource
  could not be updated in domain 'ABC.local' for the following reason:
  Unable to get Computer Object using GUID.
  
  ERROR2:Cluster resource 'SQL Network Name (tcsdb)' in clustered
  service or application 'SQL Server (MSSQLSERVER)' failed.
  
  ERROR1:Cluster network name resource 'SQL Network Name (tcsdb)' cannot
  be brought online. The computer object associated with the resource
  could not be updated in domain 'ABC.local' for the following reason:
  Unable to get Computer Object using GUID. how we can fix this issue
This means the cluster network name (tcsdb) can't be registered with Active Directory at the moment. It could be that your newly primary node can't see a domain controller, or can't see a writeable domain controller, may have a network interface down, may be having routing problems, etc.