I haven't reset the router yet. The last thing I did yesterday was run JRT and rebooted, and now I have access. I had tried the power cycle twice, it had no effect. I think I have narrowed the source of the problem to one web site, but whatever it is, it isn't visible. I will stay off the site for a week or so before I go back.
Thanks both of you.
Fractal Design R5 | Asus Z170 Pro | Intel i5 6600k | 16 GB G.Skill Ripjaws DDR4 2133 | Seasonic 650w PSU | eVGA GTX 550 TI | Samsung 960 M2 500 GB | Samsung 850 EVO 500 GB | ASUS Burner | Windows 7 64-bit