Error - multiple user login

Hi everyone,
I own a small hotel and we use mikrotik to manage the wirless internet access for our guests.
Since today I have been facing a very strange problem:
whenever a single user is signed in his connections becomes publicly available to anyone that tries to connect to the network. It does not prompt the new user for a username or password, but simply connects them via the original users connection.
This problem first appeared today (Sep 29). Has anyone encountered a similar problem or have any idea what the cause for this issue could be?
Many thanks in advance!
Daan

Hi everyone,
I own a small hotel and we use mikrotik to manage the wirless internet access for our guests.
Since today I have been facing a very strange problem:
whenever a single user is signed and used 4 hours after that if customer puts computer in sleepmode after that ,the user is notworking (this is 24h validity coupon).
This problem first appeared (from 1 oct 2012). Has anyone encountered a similar problem or have any idea what the cause for this issue could be?

thanks by
viswayk