Today I had an error with my google accounts. I cannot sign in to them because of a 400 error which says:
The server cannot process the request because it is malformed. It should not be retried. That’s all we know
I tried deleting cookies, disabling the shield, and everything else which was listed on the forum. I don’t know why it happened, everything was working fine yesterday. I’m now on another browser when using gmail. Thanks!
These two topics have workarounds. In your case, the shields may be up at the error page even though you disabled them for login. You will have to disable shields on that page also. Worked for me and I hope it will work for you too!