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We have 2 Exchange 2013 Enterprise Servers: Internal Mailbox server and a DMZ Edge Server.
In 2016, we migrated our old exchange 2007 Standard server to these servers. We stood up these 2 new boxes, migrated all mailboxes over to the new mailbox server, and got the Edge server working with that server (created a subscription). After we got everything working, mailboxes and mail flow (in and out), we uninstalled the old 2007 mailbox server.
In the Event Viewer on the Edge server, I've been seeing Event 1005: Could not decrypt credential cn=<edge server>,<old 2007 mailbox server> using Edge default certificate with thumbprint <thumbprint>. Please unsubscribe and resubscribe your Edge Transport server. I unsubscribed and resubscribed but this error message keeps coming up.
I ran the Get-ExchangeServer powershell command on the Edge server, and I see the old 2007 mailbox server listed. I ran the same command on the 2013 mailbox server, and this old 2007 mailbox server does not come up on the list, it just list the 2013 mailbox server and the 2013 edge sever.
I check our AD and the old 2007 mailbox server does not exist. I also went to ADSI Edit, and I don't see the 2007 mailbox server listed in the Exchange Administrative Group (<some key>) -> Servers OU.
Any suggestions on how I can get our new Edge Server from seeing the old 2007 mailbox server?
I am writing here to confirm with you any update about this thread now.
If the suggestion below helps, please feel free to accept it as an answer to help more people.
I'm sorry I didn't see this until now.
I disabled and renamed the 2 send connectors on the 2013 hub transport server. I created a new subscription using the new-edgesubscription command, then I manually deleted the 2 old send connectors from the hub transport server. This didn't work it still saw the 2007 mailbox/hub transport server, on the edge server.
This weekend, I'll run the remove-edgesubscription, then new-edgesubscription and see If it gets rid of the old server.
Thank you.
Scott
Could you remove the old server from Edge Subscription successfully now?
I unsubscribed and resubscribed but this error message keeps coming up.
Did you remove the Edge Subscription from Exchange Hub Transport server (Contained in Mailbox server in Exchange 2013)?
Here is a suggestion from Microsoft article about this issue: Couldn't decrypt EdgeSync credentials. Please unsubscribe and then resubscribe your Edge Transport server
You could use the command below to check whether there exists Edge Subscription on both Mailbox server and Edge server:
Get-EdgeSubscription
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