Could not sign in to PGE

I went to pge.com website without any issue. However when I clicked on the button "sign in" on that page, I got the following error:

The requested URL was rejected. Please consult with your administrator.
Your support ID is f78fdb84-c9d0-445d-8fce-88dc3c69ba6e

I tried using different browsers and different OS and got the same error.

The interesting thing is when I used the same machine in 2 of my friend's house, I was able to log in with all different browsers/OS  and did not encounter any issue. My friends also use xfinity internet but they live in a different city.

I wonder what could cause this problem. Could that be related to the new cable modem I received a few months earlier?

Thanks for any insight!