I am trying to login to Math.SE from here: https://math.stackexchange.com/users/login using my Google OpenID (by clicking the Google button). It can't open the page due to too many redirects (I am already logged in to Google). Here is a screenshot of the problem:
I don't know if the fault is on Stack Exchange's or Google's end, but I want to use Math.SE. I don't yet have an account on Math.SE.
What could be the problem?
The same happens for other sites where I don't have an account, like Android and Stats.