Outlook: ADFS Error 0xCAA70010

KB ID 0001652


While trying to connect Outlook (2016) to an Office 365 email account;

Outlook ADFS 0xCAA70010 Error

We can’t connect you

It looks like we can’t connect you to one of our services the moment. Please try again later, or contact your helpdesk if the issue persists.




This was happening because my ADFS server was using a ‘self-signed’ certificate (i.e. not a purchased one). This should NEVER be done in a production environment, but this is my test network, (so I refuse to spend money on certificates for testing etc!)

I cured the problem by simply importing/trusting the CA Certificate from my internal Certificate Services CA server, (that issued the ADFS servers certificate).

Fix ADFS 0xCAA70010 Error

If you see this on a production server, with a publicly signed certificate, check that the ‘problem’ client does not need a Windows Update, to update its trusted CA Certificates, or that your certificate simply hasn’t expired, and you ‘forgot’ to renew it. If so;

ADFS: Changing the Certificate

Related Articles, References, Credits, or External Links


Author: PeteLong

Share This Post On

Submit a Comment

Your email address will not be published. Required fields are marked *