f17 no internet after power failure, power restored

[Greg Woods]

If it keeps resetting to the same wrong date, chances are the power
failure caused your machine's hardware clock to be set to the wrong
time. Try first getting your OS system clock set properly (as you have
done already), and then use "hwclock" to sync the hardware clock to the
system clock. I have occasionally had to do this in the past.

--Greg