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Exchange 2007/2010/2013: ActiveSync asking for Domain Name on Mobile Device


Post migration from Exchange 2010 to 2013, mobile devices are not connecting with out domain name.



Unable to query domain and authentication failed.



There is no solution for it. It is by design as there is no field for the domain name in the Exchange Active Sync configuration.



1. Login to the CAS server

2. Open IIS Manager

3. Expand Default website

4. Highlight the Microsoft- Server-Activesync and select authentication on the right side


5. Go to the properties of the authentication

6. Right Click on Basic Authentication and click edit.


7. Type backward slash in Default Domain “”  and type your domain name in the Realm


8. Reset IIS by the cmd – “IISRESET /NOFORCE /TIMEOUT:120”


Prabhat Nigam

Microsoft MVP | Exchange server


7 Responses to “Exchange 2007/2010/2013: ActiveSync asking for Domain Name on Mobile Device”

  1. Exchange 2010/2007 to 2013 Migration and Co-existence Guide « Says:

    […] Active Sync Config without Domain Name: […]

  2. NeWay Technologies – Weekly Newsletter #55 – August 8, 2013 | NeWay Says:

    […] Exchange 2007/2010/2013: ActiveSync asking for Domain Name on Mobile Device – 6-Aug-2013 […]

  3. Scaglione Says:

    Really fascinating information! Perfect just what I was looking for!

  4. Justin Says:

    I have been battling a post SBS migration tasks with an exchange server that is attached to a different domain than the email address (domain.local vs This has helped with the mobile device connectivity greatly.

    Thank you!

  5. MCP Says:

    I’m prepping for migration from 2010 to 2013 this summer; which domain name needs to be entered here? The local (abc.lan) domain or the external domain ( If this is a hybrid environment with on-premises 2013 server and Office365 does that change this at all?

  6. Prabhat Nigam Says:

    This is a domain for authentication so in which AD domain your users will login should be entered here. We need to use netbios name of the domain.

  7. John Says:

    This is great information. Saved me a great deal of research and many headaches!

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