Posts Tagged ‘authenntication protocol’


Scenario

I had quite a few Windows 10 client machines running Office 2016 and also using Office 365 online.  Email was fine and synchronized readily, but as soon as I connected either a SharePoint calendar or contact list, Outlook reported send and receive errors, gave an error window that said server authentication protocol not supported, or both.  Outlook might disconnect from Exchange Server or just not sync.

You might see the following:

outlook1

outlool

This was a frustrating error and reported quite often, but none of the proposed solutions actually worked for my bevvy of machines.  I owe a debt of gratitude to one of the IT staff members at Bellevue School District who snooped around and came up with a fix that does work.

Updates at Fault

A lot of online postings suggest, correctly, that one or more updates has produced this error, and removing them solves the problem.  However, a subsequent and replacement error just returns the error.  And Windows 10 just wants to install those updates for you.

The Fix

Delete the connected contact and/or calendar from Outlook.  Then close Outlook.

Run regedit.  Navigate to the following area and add this key as a 32-bit double word with a value of 0:

HKCU\SOFTWARE\Microsoft\Office\16.0\Common\Identity\EnableADAL

 

Once that is done, open Outlook and see if the same error occurs.  If not, go to Office 365/SharePoint/<calendar>or<contact> and re-connect to Outlook.

If the error persists, you will need to create a new Outlook profile.  If the existing profile has other connections and/or data files, be sure and keep that profile so you can add them properly to the new profile.  Once the new profile has been loaded and is syncing properly, you can go back and remove the original profile.

To make this even easier for you, create a text file but rename it to <something<.reg on your desktop or other convenient location.  Right click on it and choose edit, then paste in the following lines.  Save it, then click to open and it will add the key to your registry.

Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\Identity]
“Version”=dword:00000001
“EnableADAL”=dword:00000000

 

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