I do not think, or even understand that that is just the problem, since from the time this things have been working, there are far more complications to these things then just extra authentication. It just happens that the server does not allow any further download or data transfer to one particular pool of resource, as it has already crossed its daily limit, because the data which is being transfered is being used by many, which limits one individual's usage or aplliant data rate.
This is something which a mother server can resist rather than just the folder server.