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Dorima-7420 avatar image
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Dorima-7420 asked KaelYao-MSFT commented

Delaying of emails delivery due to new secondary installed exchange server 2016

I have installed a second Exchange 2016 server in an existing environment to create a DAG between the two servers but after installing the second server I have noticed the delay of emails that are stuck in the queue from the second server but if we disconnect the newly installed server, the emails are being delivered smoothly. I am requesting your help to figure out why emails are being first routed to the newly installed server and why they are delaying to be delivered.

I am getting "The periodic heartbeat to the primary server (Server name) Failed" from Application event logs.

Emails can be delayed between 1 to 5 hours without being delivered. Your help is highly appreciated, thank you.

office-exchange-server-mailflowoffice-exchange-server-connectivityoffice-exchange-server-deployment
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Is the new server behind a firewall or blocked from communicating wth the older server in anyway?

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They are all in the same LAN with no firewall. Thank you

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The periodic heartbeat to the primary server (Server name) Failed"
tells me the server is getting blocked, or the transport service is down or the server itself is down.


Which server is getting that error?

HAve you verified the transport service is up and running?

What does this show on the new server?

 Get-ServerComponentState -id <NewServer>
 Test-ServiceHealth

Anything in the event logs on the new server?

Message routing through the new server is expected however:

https://docs.microsoft.com/en-us/exchange/mail-flow/transport-high-availability/shadow-redundancy?view=exchserver-2019

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AndyDavid answered Dorima-7420 commented

You should disable the anti-virus completely and test.
Note that file-level anti-virus needs to have exclusions set:

https://docs.microsoft.com/en-us/exchange/antispam-and-antimalware/windows-antivirus-software?view=exchserver-2019


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Thank you, let me try and check the outcome. antivirus is only installed on the first server

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