Google Product Forums
Re: The gmail on my iPhone has stopped working, and after speaking to an Apple representative, it seems to be a gmail issue
Google Mobile Help Forum
Other Google Products
Since this morning, I am also facing the same issue. It was working fine till last night. It is also not working on my iPad.
I have double sign-on enabled. I tried creating a new application specific password, however, it still says, incorrect user name or password. Anyone else facing this?