Hello, thanks very much for your quick response.
I don't think the URL mask can be set in Board Settings in version 1.9.1.2. I'm attempting to upload a screen shot.
I had also tried that exact code snippet that you pointed me to, both in the web.config file at the root of the server, at one level above the YAF directory (my domain level), and at the YAF directory level. In the latter case, it seemed to break the Forum access so I took it out. In the other two instances, there was no change in behavior.
board settings.png You have insufficient rights to see the content.