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Outlook Authn Error - Can’t connect to the server then recovers itself

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Problem

Outlook will hang when the client is first opened, saying “Connecting to server…” and then “Can’t connect to the server.”, finally recovering all on its own and working fine. In the Connection Status window with my situation, there was an Authn error ‘ERROR‘ that seems to be blocking the connection.

Solution

None of the traditional rip & replace steps worked to fix this problem. Current, Semi-Annual, Repairs, Clean Wipes, FixIT, and the kitchen sink. Turned off IPv6, and this problem went away instantly.

(Using DNSFilter on Lenovo E14 Laptop.

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