Wi-Fi & connectivity

[Lynleesmith]

I’ve had this problem before, but it’s only on 1 roku at a time. But now, none of my rokus will connect. They keep saying there’s no wireless connection. I’ve restarted the roku multiple times, restarted my router multiple times, and unplugged both multiple times. Every other device in my house is connected and fine besides the rokus. Not even the roku right next to the router will work 

[renojim]

When you to Settings->Network->Set up connection->Wireless does your network show up?  If so, do you get an error message when you try to connect?

If your router's Wi-Fi channel is set to "Auto" it may have changed to a channel that isn't supported.

[makaiguy]

Further -

Your problem may have been caused by a recent update to your router which affects some Roku models. If you receive this update it changes the router's wifi connection parameters from b/g/n to g/n. This has been reported lately with equipment from Comcast/Xfinity and Cox, but there may be others.

Affected users report the Roku identifies the local network as available and rates the connection quality, but will not then connect. The fix is to switch the router configuration protocols from the g/n wifi that was set by the update back to b/g/n. If you don't have access to your router's configuration controls you may have to have your internet provider do it for you.

Step-by-step post from @AvsGunnar for Comcast/Xfinity users:
https://community.roku.com/t5/Network-Wireless-Wired-Connections/Error-014-30-stuck-for-three-days/m...