some of our clients failed to completed autodiscover: new clients unable to configure new profile profile of old clients corrupt and ask user to create a new profile or use old data. OWA is ok on any machine My account can create new profile on my machine but can't create new profile on a problematic machine. autodiscover url can return 600 my machine did have the issue but now it is ok, the network environment didn't change If I set outlook.office365.com to our public IP, the outlook can connect. log on problematics machine: log on my machine: both failed one and sccuessful one are connecting to the same server. For now, i have no idea about the current issue. It is completely random on both internal and external client.

Hi @RICK-0238 , What is your environment? Hybrid deployment or all mailboxes are in Exchange online? Are there any specific errors when configuration errors occur? If so, please share with us. 1.Please try to upgrade your outlook to the latest version. 2.In order to better find the cause of the error, please use ExRCA to test Autodiscover. If there is a problem, a detailed problem report will be generated. About ExRCA: Microsoft Remote Connectivity Analyzer 3.If the above test fails, please check the following settings: 1)If all mailboxes in your organization are in Exchange Online, please check the Autodiscover CNAME record. 2)If you have an Exchange hybrid deployment, set up the Autodiscover public DNS records for your existing SMTP domains to point to an on-premises Exchange server. For more information you could refer to: Outlook can't set up a new profile 4.Please check if there are related error logs in the Event Viewer. If so, please share with us. Please remember to cover your private information. If the response is helpful, please click "Accept Answer" and upvote it. Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

autodiscover failure

xhope 221

some of our clients failed to completed autodiscover:

new clients unable to configure new profile
profile of old clients corrupt and ask user to create a new profile or use old data.
OWA is ok on any machine
My account can create new profile on my machine but can't create new profile on a problematic machine.
autodiscover url can return 600
my machine did have the issue but now it is ok, the network environment didn't change
If I set outlook.office365.com to our public IP, the outlook can connect.

log on problematics machine:

log on my machine:

both failed one and sccuessful one are connecting to the same server.

For now, i have no idea about the current issue. It is completely random on both internal and external client.

Gloria Gu 3,896 Reputation points

2020-11-11T05:50:34.403+00:00

Hi,
Since your issue is related to Exchange, there will be Exchange support team to help you solve the problem~
xhope 221 Reputation points

2020-11-11T09:27:15.633+00:00

thanks you so much!

1 answer

Lucas Liu-MSFT 6,176 Reputation points

2020-11-11T09:27:24.377+00:00

Hi @RICK-0238 ,
What is your environment? Hybrid deployment or all mailboxes are in Exchange online?
Are there any specific errors when configuration errors occur? If so, please share with us.
1.Please try to upgrade your outlook to the latest version.
2.In order to better find the cause of the error, please use ExRCA to test Autodiscover. If there is a problem, a detailed problem report will be generated.
About ExRCA: Microsoft Remote Connectivity Analyzer
3.If the above test fails, please check the following settings:
1)If all mailboxes in your organization are in Exchange Online, please check the Autodiscover CNAME record.
2)If you have an Exchange hybrid deployment, set up the Autodiscover public DNS records for your existing SMTP domains to point to an on-premises Exchange server.
For more information you could refer to: Outlook can't set up a new profile
4.Please check if there are related error logs in the Event Viewer. If so, please share with us. Please remember to cover your private information.

If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
Please sign in to rate this answer.
xhope 221 Reputation points

2020-11-12T01:33:20.367+00:00

Hi Lucas,

Below are the answers:

On-premise Exchange server

Many clients start to have the issue recently. I don't think it's related with Outlook version

ExRCA was successful

I found below error in event log:
Event ID 3003

Protocol /Autodiscover failed to perform token rehydration because source identity DOMAIN\user does not have token serialization permission.

the error message is the same with below post. I don't know whether the error log is related or not?
https://social.technet.microsoft.com/Forums/lync/en-US/8dd7f1ac-11d4-4663-8e5a-37cbb4708c33/cant-stop-event-id-3003-and-3002-in-the-event-log-token-serialization

Lucas Liu-MSFT 6,176 Reputation points

2020-11-12T09:42:09.317+00:00

Hi @RICK-0238 ,
In addition, according to my understanding, outlook.office365.com is the IP range available for Exchange Online. In the new version of Outlook, Outlook is prioritising Office 365 for the Autodiscover queries above all other Autodiscover methods.
Please follow the steps below to modify the registry form and skip the process of querying office365. The resolution requires you to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, please ensure that you follow these steps carefully. It’s recommend backing up the registry before you modify it.
About how to back up the registry: How to back up and restore the registry in Windows

Close the outlook and open the regedit.

Navigate to the following path: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\AutoDiscover.

Lucas Liu-MSFT 6,176 Reputation points

2020-11-17T09:07:12.467+00:00

Hi @RICK-0238 ,
Do 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.

Thanks for your understanding.

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Lucas Liu-MSFT 6,176 Reputation points

2020-11-23T10:24:55.663+00:00

3.Select the Autodiscover folder, and right-click on the empty space in the right-hand side to create a new DWORD key - the property should be ExcludeExplicitO365Endpoint set to a value of 1.
4. Reboot your computer.
For more information you could refer to: Outlook Autodiscover Registry Edit to Disable Office 365 Autodiscover
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

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