Hi, Recently I migrated Exchange 2016 to 2019, then I temporarily shut down Exchange 2016 and removed the Autodiscover URL from Exchange 2016 Everything works well but Exchange 2019 shows the below error: Details I run this command Get-ClientAccessService | Select Name, AutoDiscoverServiceInternalUri, AutoDiscoverSiteScope | Format-List the result is like this : Name : ServerExchange2019 AutoDiscoverServiceInternalUri : https://autodiscover.FQDN/Autodiscover/Autodiscover.xml AutoDiscoverSiteScope : I appreciate any feedback on this. Thank you so much

Hi @ Hossein , Welcome to the Microsoft forum. Based on your description, the error may because that the external URL is not configured properly. To work around this issue, you should check the external URL for the following virtual directories: Get-WebServicesVirtualDirectory -server YourExchangeServerName | fl name, url Get-AutodiscoverVirtualDirectory -server YourExchangeServerName | fl name, url Get-ActiveSyncVirtualDirectory -server YourExchangeServerName | fl name, url If the external URL is blank, assign a value to the external URL that corresponds to the public FQDN. More details just follow the article: <a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsupport.microsoft.com%2Fen-us%2Ftopic%2Fautodiscover-event-id-1-after-installing-exchange-server-2019-cu3-or-exchange-server-2016-cu14-93850e62-4cf4-8a76-5fd4-c8ce6f032015&data=05%7C02%7Cv-zhitaohu%40microsoft.com%7C62de63e9da23477f665d08dc73f1f145%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638512730205164206%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=R2Zr%2B7DIbgq8jB0TOk4PaTNKxMQPXQxH7y8Fx9u6fwY%3D&reserved=0" rel="ugc nofollow">Autodiscover Event ID 1 after installing Exchange Server 2019 CU3 or Exchange Server 2016 CU14 - Microsoft Support Hope this helps.

Set the ExternalURL property of the Autodiscover virtual directory, like this: Get-AutodiscoverVirtualDirectory -Server | Set-AutodiscoverVirtualDirectory -ExternalUrl https://autodiscover.contoso.com/Autodiscover/Autodiscover.xml

Event ID 1 MSExchange Autodiscover

Accepted answer

Mike Hu-MSFT 4,140 Reputation points Microsoft Vendor

2024-05-14T09:01:26+00:00

Hi @Hossein,

Welcome to the Microsoft forum.

Based on your description, the error may because that the external URL is not configured properly.

To work around this issue, you should check the external URL for the following virtual directories:

Get-WebServicesVirtualDirectory -server YourExchangeServerName | fl name, url

Get-AutodiscoverVirtualDirectory -server YourExchangeServerName | fl name, url

Get-ActiveSyncVirtualDirectory -server YourExchangeServerName | fl name, url

If the external URL is blank, assign a value to the external URL that corresponds to the public FQDN.

More details just follow the article: Autodiscover Event ID 1 after installing Exchange Server 2019 CU3 or Exchange Server 2016 CU14 - Microsoft Support

Hope this helps.
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Hossein Azarkhah 45 Reputation points

2024-05-14T10:10:23.8266667+00:00

Thank you for responding

external URL and Autodiscover work fine

I have an issue with the internal account

our external URL and internal URL are different

should I set an external URL?

Autodiscover error is displayed when users open outlook

Get-ActiveSyncVirtualDirectory -server exchangeinternalname | fl name, url

Name : Microsoft-Server-ActiveSync (Default Web Site)

MobileClientCertificateAuthorityURL :

InternalUrl : https://exchangeinternalname.domainname.com/Microsoft-Server-ActiveSync

ExternalUrl : https://exchangeexternalname.domainname.com/Microsoft-Server-ActiveSync

Get-AutodiscoverVirtualDirectory -server exchangeinternalname | fl name, url

Name : Autodiscover (Default Web Site)

InternalUrl :

ExternalUrl :

Get-WebServicesVirtualDirectory -server exchangeinternalname | fl name, url

Name : EWS (Default Web Site)

InternalNLBBypassUrl :

InternalUrl : https://exchangeinternalname.domainname.com/EWS/Exchange.asmx

ExternalUrl : https://exchangeexternalname.domainname.com/EWS/Exchange.asmx

Hossein Azarkhah 45 Reputation points

2024-05-15T07:25:09.42+00:00

Hi Mike,

After a while, the problem was fixed

but I want to know why this error appeared?

Internal users Must check the External URL that matches public FQDN?

Mike Hu-MSFT 4,140 Reputation points Microsoft Vendor

2024-05-16T04:14:40.0233333+00:00

Hi Hossein,

Happy that your problem was fixed.

For your internal users, the best practice is often to use the internal hostname or internal Fully Qualified Domain Name (FQDN) of the Exchange server. However, if the internal DNS is configured to point to the public FQDN or if the internal Exchange server certificate has only the public name, the internal clients could be directed to use the external URLs. The external URL is typically used by users outside the organization's internal network (remote users).
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