You may have banned by universal selector in the banning options (ie. * or some form of this), which could ban everyone.
To clear it out look in the table 'TABLE_PREFIX . setting' and search for varname = 'banip' and grouptitle = 'banning'. Under value will be a list of all banned IP addresses, look through them and make sure there isn't a misplaced universal selector, if there is, clear it out and save.
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