Microsoft Project’s “Unsupported server” Error

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Microsoft Project’s “Unsupported server” Error

We have been using Microsoft Project 2016 for a while now at Projility. As consultants, we connect to various Microsoft Project Online and Project Server environments. We noticed recently, however, an error that we have never encountered before with a previous version of Microsoft Project. When trying to connect to a Project Online environment, we got the following message:

“The Server you are trying to access is using an authentication protocol not supported by this version of Office.”

We tried a number of things to get the error to go away, but we eventually figured out that this issue only occurs when a user is already logged into Microsoft Project with different credentials than the account that he or she is trying to connect to. We have never seen this issue when using any previous version of Microsoft Project, so it must be a new feature.

The Solution

Sign into Microsoft Project using the credentials of Project Online/Server account to which you are trying to connect.

If you need to constantly connect to multiple accounts:

  1. Click “Switch account.”
  2. Microsoft Project Online

  3. Then click “Add Account” and enter the credentials of the account that you wish to connect to.
  4. Microsoft Project Tips

    Once you have added the necessary accounts, you will be able to connect to any of them.

    Keep in mind that this error should only impact consultants who are connecting to multiple Project Online environments. As a Project Manager, you only need to log in with your organization’s credentials.

    Stay tuned for more helpful Microsoft Project Server and Microsoft Project Online tips and advice on Tom’s Tech Talk.


    Projility provides expert solutions for effective change. We offer enterprise portfolio and project management solutions based on Microsoft Project Server and Project Online, with tailored dashboard reporting, analytics, and decision-making tools via our Hammerhead technology. Projility also implements professional services automation systems established on Microsoft Dynamics CRM Project Service, and presents cloud-based strategies, migrations, and hosting solutions through Microsoft Azure. Contact us for more information.

About the Author:

Tom Henry
Tom Henry is the PPM Practice Manager at Projility. He leads a team of experienced PPM consultants in making clients more adept, productive, and profitable. Tom has been involved with project and portfolio management since graduating from Bournemouth University in the UK, working first in London and then moving to the US to further pursue his career. Tom prides himself on being able to understand his clients’ needs and translating those needs into simplified PPM solutions.

About Projility

PROJILITY is a Microsoft PPM and CRM services leader and product innovator. Our Hammerhead products have helped organizations around the world save hundreds of thousands on Microsoft Project Server training, customization, and support costs.

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