EX6250 extender not allowing me internet access after power outage

[BSchemmel]

Hello,

I've recently had a power outage to my home.  When the power came back on I was no longer able to go to websites while connected to the EX6250.  When I am connected to the extender and try to navigate to any website with my iPad using Safari, I get the following error:

"Safari cannot open the page because it could not establish a secure connection to the server."

When I try on Chrome, I get this message:

"This site can't provide a secure connection"

"ERR_SSL_PROTOCOL_ERROR"

When I try to use Chrome on my PC Laptop to go to a website, I get this:

Your connection is not private

Attackers might be trying to steal your information from docs.microsoft.com (for example, passwords, messages, or credit cards). 

NET::ERR_CERT_AUTHORITY_INVALID

I do not have these problems when I am connected to the router (Nighthawk R7000P).  Any suggestions would be greatly appreciated.

[plemans]

Did you try factory resetting it and reinstalling it? 

Did you install it using wps or the installation assistant? 

what modem/gateway is the router connected to? 

What firmware's on the router? 

And on the extender?