It has been 2 days since I am facing this problem, I can log into my account sometimes but I get logged out automatically after (10/20 minutes). After I try to login again it says that i am temporarily blocked by the administrator. Then I can't login for couple of hours. Anyone facing this issue? But i can use the m1.codeforces.com site without any issue MikeMirzayanov, BledDest please fix the issue.
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if you are using carrot, try turning it off. it seems like they are blocking carrot apis recently.
I use carrot but i have no problem with login i think the problem is related to something IP because it works on VPN