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DonAbernathy-3997 asked ZhengqiLou-MSFT commented

Afer Replacing DNS and DHCP server after server cash, My cleint comptuers can no longer connect ot the exchange server.

We had two domain controllers, one was used for AD, DNS, DHCP, the second was used for DNS and Exchange, The Server with AD crashed and we had to replace it. I put a new server on the domain, configured dhcp and dns, everything works fine as far as shares, and joining the domain, however, the outlook on the client machines can no longer connect and download email..

office-exchange-server-connectivity
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DonAbernathy-3997 answered ZhengqiLou-MSFT commented

OWS work fine both local and remotely using the ip address / owa.

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Hi @DonAbernathy-3997 ,

Thanks for the respond.

Please do the following methods:
1. Test Autodiscover by https://testconnectivity.microsoft.com/tests/exchange or your Outlook client(hold CTRL and right click the icon) > Test Email autoconfiguration.
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2. Create a new mailbox and see if it could login to Outlook client and connect with Exchange without issues.
3. Test-OutlookConnectivity.
in Exchange 2016 or later version you may use: Test-OutlookConnectivity -ProbeIdentity OutlookMapiHttp.Protocol\OutlookMapiHttpSelfTestProbe
in Exchange 2013 or earlier you may use: Test-OutlookConnectivity -ProbeIdentity Outlook.Protocol\OutlookRpcSelfTestProbe

Regards,
Lou

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Hi @DonAbernathy-3997 ,

Do the suggestions above help? If the issue has been resolved, please click “Accept as answer” to mark helpful reply as an answer, this will make answer searching in the forum easier and be beneficial to other community members as well.

Regards,
Lou


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ZhengqiLou-MSFT answered

Hi @DonAbernathy-3997 ,

Have you tried using OWA or EAC login to your Exchange server?
If these two work correctly, I think that could be an autodiscover issue.
So you can first check it with Outlook-> Test E-mail Autoconfiguration or EXRCA

If the OWA and EAC failed too, then I may guess this is belongs to AD/DC.
1. Run Get-ExchangeServer | FL Name,OriginatingServer to check the domain controller that is responsible for Exchange.
2. Check the AD replication: Troubleshooting Active Directory Replication Problems

If there are something useful, you could share them with your personal information covered to make me better understand your issue.

Regards,
Lou


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