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ArchilBerikishvili-8817 avatar image
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ArchilBerikishvili-8817 asked LucasLiu-MSFT commented

Exchange 2013 hybrid mail flow breaks if old domain controller (2008) is taken offline

We have exchange 2013 cu 23 with hybrid configuration, on-premises we have couple of mailbox servers and an edge server to route emails to office 365, we also use SMG to route emails to the internet. in AD we have 3 domain controllers one of them is 2008 which we want to decommission, but mail flow from on-premises to exchange online stops if that DC is taken offline. where can we start looking at the issue? any suggestions?

windows-active-directoryoffice-exchange-hybrid-itpro
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Hi @ArchilBerikishvili-8817 ,
In order to solve this issue, I want to confirm with the following points:

Is the mail to other external recipients affected after DC1 is disabled?
Is the replication between DCs normal after the decommission DC1?
Are there any related error logs appearing? If so, please share it with us. please pay attention is to cover your personal privacy information.
Are non-delivery reports generated after the failure to send mail between the on-premises and O365?

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Hi @ArchilBerikishvili-8817 ,
I am writing here to confirm with you how thing going now?



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Hi @ArchilBerikishvili-8817 ,
I am writing here to confirm with you how thing going now?




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Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.


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ArchilBerikishvili-8817 avatar image
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ArchilBerikishvili-8817 answered

@AndyDavid this event doesn't show up on edge server, on mailbox servers it shows:

dc1 CDG 1 7 7 1 0 1 1 7 1
dc2 CDG 1 7 7 1 0 1 1 7 1
dc3 CDG 1 7 7 1 0 1 1 7 1

dc1 is the one we're trying to decommission

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AndyDavid avatar image
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AndyDavid answered ArchilBerikishvili-8817 commented

Ok, when you take the DC offline, does it affect all mail flow or just mail flow to 365? Which server are the messages queued on and what is the error in the queue and in the event logs?
Nothing is hardcoded to that DC is it?

 Get-ExchangeServer |FL *static*
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nothing is hardcoded to dc1, when its offline hybrid mail flow is broken. this is the output of that command on both edge and mailbox.

StaticDomainControllers : {}
StaticGlobalCatalogs : {}
StaticConfigDomainController :
StaticExcludedDomainControllers : {}

StaticDomainControllers : {}
StaticGlobalCatalogs : {}
StaticConfigDomainController :
StaticExcludedDomainControllers : {}

StaticDomainControllers : {}
StaticGlobalCatalogs : {}
StaticConfigDomainController :
StaticExcludedDomainControllers : {}

StaticDomainControllers : {}
StaticGlobalCatalogs : {}
StaticConfigDomainController :
StaticExcludedDomainControllers : {}

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AndyDavid avatar image AndyDavid ArchilBerikishvili-8817 ·

Sorry, use the status switch just to confirm

 Get-ExchangeServer -status  |FL *static*

What about the errors in the event logs and queues? There should be something in the queue if the messages arent moving.



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i will recreate the issue later on and share that information with you.

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