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    Team,

    We require help with respect to client connectivity issue which we are facing at our customer 

    Target Domain :- target.COM SMTP           Domain :- abc.com

    Source Domain :-  source.com SMTP  Domain :- abc.com

    Problem :-- Externally outlook clients are not able to connect to exchange server and prompts continues for credentials.

    Detail Description :- Client should  connect outlook over the internet using outlook anywhere feature

    External Connectivity :- From Internet à Public DNS -à Reverse Proxy à Load Balancer à Exchange Servers

    Existing :- Currently we had disabled Autodiscover, OWA Url  for security reason from their reverse proxy(Apache) and kept exchange EWS url accessible externally for outlook client access 

    Please suggest.

    Friday, October 19, 2018 12:39 PM

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    Hi,

    Just checking in to see if above information was helpful. Please let us know if you would like further assistance.

    Regards,

    Manu Meng

    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.

    Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

    • Marked as answer by Raritan Friday, November 2, 2018 6:01 PM
    Wednesday, October 31, 2018 10:38 AM

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    If Autodiscover is disabled on the reverse proxy then that's your issue.  The first thing Outlook does when it starts up is to try to connect to Autodiscover.  Depending on how you disabled Autodiscover, if Outlook resolves the Autodiscover address but can't login to it, then it will prompt the user for credentials.
    • Proposed as answer by Manu Meng Tuesday, October 23, 2018 2:40 AM
    Friday, October 19, 2018 7:01 PM
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    Outlook 2013 and 2016 working fine issue is with outlook 2010 users client connectivity with exchange 2016 server please help me the minimum version requirement and patches details which has to be updated on client side.
    Tuesday, October 23, 2018 11:57 AM
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    Outlook 2013 and 2016 working fine issue is with outlook 2010 users client connectivity with exchange 2016 server please help me the minimum version requirement and patches details which has to be updated on client side.

    Disable Mapi over Http and temporarily use Outlook Anywhere and see if issue disappears in Outlook 2010.

    Set-OrganizationConfig -MapiHttpEnabled $false


    Regards,

    Manu Meng

    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.

    Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

    Thursday, October 25, 2018 9:56 AM
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    Hi,

    Just checking in to see if above information was helpful. Please let us know if you would like further assistance.

    Regards,

    Manu Meng

    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.

    Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

    • Marked as answer by Raritan Friday, November 2, 2018 6:01 PM
    Wednesday, October 31, 2018 10:38 AM