Error message is server closed connection Worked fine until a few months ago.
Please make sure you are using the correct IMAP server settings, per AOL’s help article.
Additionally, note that AOL will likely require you to use a App Password as described here.
Hopefully this helps!
Dave! I am delighted to say that the key to entry was a special password generated by AOL. This methodology was kept ludicrously secret by them and took a real effort to extract from them by online chat as they are almost definitively reluctant to communicate save by a transatlantic phone call.