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Admin accounts cannot access ECP, Exchange 2019 CU12

SAT 26 Reputation points
2023-02-20T12:20:27.59+00:00

We migrated from Exchange 2010 to Exchange 2019 CU12. But none of original Org Management access accounts get access the ECP. We all get an http 500 error. I created a brand-new account and that works fine. The new account has a mailbox On Prem, but all the old admin accounts mailboxes are in O365. Any ideas on how to resolve this? I just looked through ADSI Edit, nothing jumped out at me, but there has to be something weird going on when I try to log into ECP from those accounts it immediately gives an http 500 error, doesn't even think about it.

I tried to access with this address https://SERVERNAME/ecp/?ExchClientVer=15.2 as well.

This is only using for SMTP relay and remote mailbox management.

Exchange | Exchange Server | Other
Exchange | Exchange Server | Other

A robust email, calendaring, and collaboration platform developed by Microsoft, designed for enterprise-level communication and data management.Miscellaneous topics that do not fit into specific categories.

Exchange | Exchange Server | Management
Exchange | Exchange Server | Management

The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.

Exchange | Hybrid management
Exchange | Hybrid management

The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.

Answer accepted by question author

Yuki Sun-MSFT 41,456 Reputation points Moderator
2023-02-24T06:37:49.7833333+00:00

Hi @SAT,

it has been resolved now. issue was related to system mailbox which were missing.

Great to know that it works now and thanks for the share! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others", I'll repost your solution in case you'd like to "Accept" the answer.

[Admin accounts cannot access ECP, Exchange 2019 CU12]*

Issue Symptom:

"We migrated from Exchange 2010 to Exchange 2019 CU12. But none of original Org Management access accounts get access the ECP. We all get an http 500 error. I created a brand-new account and that works fine."
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Resolution:

"it has been resolved now. issue was related to system mailbox which were missing. I used the following command which is mentioned the article https://social.technet.microsoft.com/Forums/en-US/b9a99e81-2e0d-4d26-b408-1f78c66946e2/administrators-cannot-login-to-ecp and it works for me."

get-aduser -filter "Name -like 'SystemMailbox*'" -Server xxxxxxx -Property Mail | ? {$.mail -eq $null} | Foreach {Enable-Mailbox $.DistinguishedName -Database xx-DAGN1-xxx001}

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  1. SAT 26 Reputation points
    2023-02-22T08:59:41.54+00:00

    it has been resolved now. issue was related to system mailbox which were missing. I used the following command which is mentioned the article https://social.technet.microsoft.com/Forums/en-US/b9a99e81-2e0d-4d26-b408-1f78c66946e2/administrators-cannot-login-to-ecp and it works for me.

    get-aduser -filter "Name -like 'SystemMailbox*'" -Server xxxxxxx -Property Mail | ? {$.mail -eq $null} | Foreach {Enable-Mailbox $.DistinguishedName -Database xx-DAGN1-xxx001}

    Was this answer helpful?

    1 person found this answer helpful.

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