"Char Jackson" wrote in message
...
On Fri, 19 Jan 2018 12:31:07 -0600, VanguardLH wrote:

If did any other tweaking of the router beyond the wifi passwords, like
using MAC or IP filtering as to which devices are allowed to connect to
the router, or port forwarding, or changing the security level of its
firewall, you might want to reset the router, just reenter the same wifi
passwords in the router, and retest the IoTs that couldn't connect
before but would now use a default config in the router. Rebooting or
restarting the router is not the same as a reset of the router.

MAC filtering is a good tip. That would cause what they're seeing.

Fair point. But the user said everything was working perfectly until a few
days ago when it suddenly stopped, possibly after a Windows update. He
wouldn't know how to access the router to set up MAC filtering.