yes

That's actually indeed the correct webmanager, so all should be good at your end.

Thanks for everyone's replies!

First, I executed the command that Jasem provided and it appears to have fixed things. Thank you!

Regarding sending along the Device Manager log from the RPi, I only seem to be able to see (using the web interface from my Mac) the most current log which, unfortunately, was run after I executed Jasem's command and simply shows everything working fine. If there is a way to dig back into old logs, just let me know how to get at them.

I am attaching a log file from the instance of KStars running on the Mac that shows the failed attempt to connect to the RPi. Not sure if that's helpful.