I just thought I'd update my post to say I've discovered what I think is a bug in File Explorer. I ran Wireshark on my Samba server to see if packets from File Explorer were actually reaching the server. When I logged into one of the shared accounts, it was clear packets were reaching the server. However, when I tried to log into my private account, absolutely no packets were seen. I created a different private account and found that I could log into that new account. A little bit more fiddling revealed that that presence of a question mark in the password of the original private account was causing Fex to not send any packets. If I eliminated the ? from the password, communication between Fex and the Samba server happened. So the upshot appears to be that non alphanumeric characters (or at least a ?) in passwords prevents File Explorer from making a connection.
Good find! :b
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