Login wont work all of a sudden

so i tried to login today to my panel after it had been working fine for weeks.
And all it does it refresh the page and show the login page again.
I have tried creating a new user, clearing my browsers cookies, cache and used a new browser setup.
I have tried error log reporting but nothing is going into the php error logs.
i have rechecked my file and folder permissions.
i am running nginx and nothing has changed in my setup.
does someone have any suggestions to fix this? as i it becoming VERY fustrating and i need to update my site asap.

If you haven’t changed anything, maybe your provider has?

There was a similar problem here: Cant login to Panel

looks like the fpm sessions folder was changed to a new folder instead of /tmp
very strange.

Have you got it to work, then?