I have a Siemens Gigaset SE567 and get DSL from Frontier. The DSL light is lit up on the router but the internet is not.
Now earlier today my phones and internet went out. Neighbors with Frontier had the same problem. A few hours later they were both restored. Then about an hour after that I lost internet, but my neighbors didnt.
I ran diagnostics on the router page and PPOE, PPOE Session, and PPP Authentication failed.
I don't know what any of that means but, I assume the problem is on my end because my next door neighbors that have Frontier have internet.
I beieve there is also a master rest on the router as well. Maybe it got messed up during your outage. IF you do use the master reset you will have to go back into your router settings and setup your username and password..Maybe just for the heck of it check those settings first. Of course you can always call your ISP and have them walk you through a few things.