My ROKU 2 is not working. One suggestion is that I replace the internal DNS address with a public DNS address. I have logged into my router, but there is not a clear way to reset my DNS address. The closest thing I can find on the ATT router page is Subnets & DHCP. I am worried about making changes that may make more problems on my computer. I can use some clear ATT instructions using the ATT Arris router login information.