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According to that KB link, you are not supposed to ONLY disable the secure connection in Outlook.
Essentially, if with Outlook you have a secured connection successfully working, then you need to “transfer” those settings to Avast, while at the same time reset ALL those transferred settings in Outlook.
That means, after transferring all those settings (including correct smtp and pop servers and corresponding ports) into Avast, you need to go back to configure Outlook as if there was no secured connection, with the UNsecured values (again, including port numbers, not only the (un)secured type of connection.
Remember that the values (port numbers, and pop and smtp servers) of that tutorial may need to be changed accordingly to the real current values for you.