This post is showing an error when you have a slow wireless broadband then you would never be connected to SQL Azure database. I was connecting to SQL Azure database using Azure Data Studio. It was the same when I used SQL Server Management Studio. When you see the error “A connection was successfully established with the server but then an error occurred during the login process.” I have confirmed this was caused by my slow wireless broadband (Celcom). I was in a place called Mulu at that point of time.