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How to avoid Simultenous login


We have 3 WLCs (ver 5.2.157) and ACS (ver.4.2) running on my network. All wireless guest users authentication limited to one simultenous login (same user) with validiy of 24 hours.

Username/passwords are created in ACS local DB. Group setting of this particular group was configured Under Maximum Session as

Sessions Available to group to 1 (one) and Sessions available to users of this group to 1 (one). Under Usage Quotas "Limit each user of this group to 24 hours of online time per day" is configured.

Users settings are inhetitaed from group settings.

In WLCs Web Authentication is selected as L3 Security settings and AAA servers (Radius Authenticaiton/Accounting) has been added for ACS Server and under the Advance tab of this SSID (WLANs>Edit) Allow AAA Overide Enabled and Enable session timeout has been given 43200.

So our requirement was only one simultenous login per users (at a time) and that is limited to 24 hours. This configuraiton was working since 09 months and now it can login more than 1 simultenous using the creadential.

Can some one advise what went wrong with this setup and how to achieve our requriement.

Thanks in advance.