Outlook Client with a SharePoint list prompts for the credential for a different URL

Outlook Client with a SharePoint list prompts for the credential for a different URL

You have a SharePoint site with FQDN URL in Alternate Access Mapping [AAM] particularly in Intranet zone. :

Internal URL Zone Public URL for Zone
http://default Default http://default
http://intra.contoso.com Intranet http://intra.contoso.com
http://inter Internet http://inter
http://custom Custom http://custom
http://extranet Extranet http://extranet

When you access the site as http://default and connect a List Library to your Outlook, it prompts for the credentials when you do F9 / Send and Receive to sync the data. In the credential prompt message box we can that that it is pointing to intra.contoso.com instead of http://default.

This behavior can occur regardless of whether you browse the site with URL in Default / Intranet / Internet / Custom / Extranet zone and connect the list / library  to Outlook.


The reason for this behavior is the way how SharePoint sends the AAM settings to the Outlook Client. SharePoint sends all the URLs for that site from AAM in below sequence to the Outlook Client:

        Intranet zone URL
        Default zone URL
        Extranet zone URL
        Internet zone URL
        Custom zone URL

    NOTE: SharePoint sends the URL in intranet zone first NOT the URL in default zone.

And in the same sequence Outlook uses the URL to connect to the SharePoint. That is, it first tries the Intranet URL and failover to subsequent URLs in above sequence.

Even  without FQDN in the AAM we can confirm that this is how the SharePoint sends the URLs. In network trace we can see the below trace from SharePoint to the Outlook Client:

    0320  61 78 42 75 6c 6b 44 6f  63 75 6d 65 6e 74 53 79   axBulkDo cumentSy
    0330  6e 63 53 69 7a 65 3d 27  35 30 30 27 20 41 6c 74   ncSize=' 500' Alt
    0340  65 72 6e 61 74 65 55 72  6c 73 3d 27 68 74 74 70   ernateUr ls='http
    0350  3a 2f 2f 69 6e 74 72 61  2f 2c 68 74 74 70 3a 2f   ://intranet /,http:/
    0360  2f 72 61 6d 72 31 39 38  33 36 36 32 35 3a 36 30   /default/
    0370  30 2f 2c 68 74 74 70 3a  2f 2f 65 78 74 72 61 6e   ,http: //extran
    0380  65 74 2f 2c 68 74 74 70  3a 2f 2f 69 6e 74 65 72   et/,http ://inter
    0390  2f 2c 68 74 74 70 3a 2f  2f 63 75 73 74 6f 6d 2f   /,http:/ /custom/
    03a0  27 20 78 6d 6c 6e 73 3a  72 73 3d 27 75 72 6e 3a   ' xmlns: rs='urn:


    There are 2 workarounds to this.

1st: Changing the AAM setting

If you are connecting the list or library to Outlook using Default zone URL then in AAM settings remove the FQDN entry in Intranet zone and add it to Internet or Custom zone.

2nd: Each user must add *.domain.com to the Local Intranet Sites dialog box

  • In Internet Explorer, click Tools, and then click Internet Options.
  • On the Security tab, click Local intranet, and then click Sites.
  • Click Advanced, and then type: *.domain.com or an IP address range (for example, *.contoso.com) in the Add this Web site to the zone box, where domain.com is your company and top-level domain names.
  • Click Add, click OK, click OK, and then click OK again to close the Internet Options dialog box.
  • Restart the computer.

Comments (3)
  1. I forgot to mention that while the order of alternate URLs is correct, that is not the first URL that Outlook will try to use (at least for email items created by a workflow).

    If the workflow that generates the email is manually initiated then the email item will contain the URL that you visited when you ran the workflow (e.g. intranet), But in the case of a workflow trigered by an event (on item created/modified), SharePoint will use the URL in your default zone.

    At that point Outlook will use the given URL the saved credentials you used in Internet Explorer or Outlook, when you check the box "remember my credentials' when visiting that URL.

  2. Prakul says:

    Hello Ramesh,

    Thanks for posting this article, I am facing the same issue when I connect a list to Outlook, In my case I have URLs configured for Default (Custom Claims and NTLM), Intranet (NTLM) and Internet(NTLM), with 2 aams for default and intranet using http and https.

    Solution 2 doesn't work for me and when I try solution 1, edits AAM URLs moving Intranet Zone to Custom Zone and try access the URL post the change it gives 404 also when I goto Manage Web Applications I still see the zones as Default, Intranet and Internet.

    Can you please provide detailed instructions for solution 1.

  3. Prakul says:

    Hello Ramesh,

    Not sure did you got a chance to look on the same.



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