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Alex Melching's avatar
Alex Melching
Iron Contributor
Dec 13, 2017

Outlook 2016 error 0xCAA70004

Some users report this error message in Outlook 2016.  Unable to determine the root cause of the message.  Information on the error code is next to none.  Any thoughts...?  
Jett Jones's avatar
Jett Jones
Copper Contributor

I was getting this same Pop-up, and I was able to fix it by running the office365 diagnostics tool:

https://diagnostics.office.com/

 

The diagnosis was invalid cached credentials, and the tool automatically cleared credentials and restarted outlook. 

I recently updated office on my laptop - so credentials may have been cached since before that, resulting in the failure.  That's mostly guessing at a cause though.

Michael Hendricks's avatar
Michael Hendricks
Copper Contributor
Apr 13, 2018
The diagnostic tool worked for me, thanks! I have seen this issue with a number of our users (random and unexplained) however the external DNS does not appear to be our problem. Our helpdesk technician usually ends up reinstalling Office and that solves it. But when it happened to my own computer, the reinstall only lasted a few days then the popup returned. I downloaded the tool and it resolved it within minutes. I hope the fix stays this time! Thanks for the post Jett.
  • Mathieu Guastella's avatar
    Mathieu Guastella
    Copper Contributor
    Jul 18, 2018

    Dear,

     

    I have the same issue when trying to add an Office 365 account :

     

    followed by this error message:

     

     

    Unable to add the account. I tried the support tool but with no success.

     

    Can you please describe ste steps you perform using the tool? There is a lot of options...

     

     

    Thank you!

  • Timo Riemer's avatar
    Timo Riemer
    Copper Contributor
    Oct 31, 2018

    Which steps did you take in the tool? I could not resolve the problem with the tool yet.

     

    THX

    Timo

      • simonsouth's avatar
        simonsouth
        Copper Contributor
        Mar 30, 2019

        Alex MelchingThanks for linking that article; it gave me the clue I needed to solve this problem.

         

        Configuring Windows 10 to access the Internet through a local proxy server (such as Privoxy) creates issues for Universal Windows Platform apps, which by default are forbidden from opening a network connection to the local machine. This includes the Azure Active Directory (AAD) broker plugin used by Office applications to perform authentication, which is effectively blocked from accessing the Internet when a local proxy is in use.

         

        The solution in this scenario is to use a tool like Tiago Andrade e Silva's Loopback Exemption Manager to explicitly grant permission for this plugin to access the local machine, thereby allowing it to connect to the proxy server and, through it, the Internet. Once I added an exemption for the AAD-broker plugins on my computer I was able to sign into my Office account again and use Outlook without the "0xCAA70007" error code reappearing.

         

    • retzolito's avatar
      retzolito
      Copper Contributor
      Jul 04, 2019

      Timo Riemer hi guys, "CMD" and "ipconfig /flushdns" that work fine for me ^^

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