Problem
When executing Hybrid Configuration Wizard you may receive plenty of different error messages related to any part of the process. One of the errors I have seen quite often is “Configure Mail Flow” error which happening on ‘Get-HybridMailflow’ command. It looking like:
[1/11/2000 18:16:56] ERROR:Updating hybrid configuration failed with error 'Subtask ValidateConfiguration execution failed: Configure Mail Flow at Microsoft.Exchange.Management.Hybrid.Engine.ExecuteTask(ITask taskBase, ITaskContext taskContext) Additional troubleshooting information is available in the Update-HybridConfiguration log file located at C:\Program Files\Microsoft\Exchange Server\V14\Logging\Update-HybridConfiguration\HybridConfiguration_date_logfile.log.