I currently use Unique Login | https://moodle.org/plugins/view.php?plugin=auth_uniquelogin
Its not stated to support 2.8 but I wouldn't see any issues with this, I would install this on a dev environment before hand to make sure it works with 2.8.
Hope this helps,
Thank You for your reply.
I installed the unique plugin in 2.8, but it shows some error " parameter id is missing." Even after installing, a user is able to lo gin with multiple times on different browsers with similar account.
It wasn't working.
Hi Graham Paull,
I had uninstalled and installed the unique plugin for MOODLE2.8+. Installation went successful. I had done all the needful configurations as in the plugin documentation, but I could see the same as before :: users can lo-gin by multiple attempts.
I am using "Email-based self-registration with admin confirmation" authentication.
Could you help me with your suggestions.