Dan,
You are correct that the site indicated is the first entry in gravity.list, great to know. As I didn't know what was happening last night, I shut off my router but let everything else remain on. This morning I powered the router back on the UI is responsive and working as expected. This is unexpected because I had rebooted the router several times last night but the UI remained unresponsive.
I am unclear if the log is cumulative. If it is, I ran one last night and this morning. If not, you will only see this morning when it is working as expected again. In looking at it, I see a lot of these lines which seem interesting:
2016-11-02 21:20:30: (mod_fastcgi.c.2702) FastCGI-stderr: PHP Fatal error: Maximum execution time of 30 seconds exceeded in /var/www/html/admin/data.php on line 197
Debug log token = shi6cqx2lo
Thank you,
Jeff