XF 1.5 Admin Control Panel not logging



I have some issues with my forum that started two days ago. When I try to log on into the ACP, it lets me enter my credentials but when I hit enter it goes back to the log in page.

I tried talking to the host, they backed up the forum to a week before but the problem is still there.

I wanna temporarily close down the forum until I figure this out but I can't access the admin panel to do so. Is there another way to close it?

Thank you!
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