Can s2Member restrict simultaneous logins?

Prevent Customers from Sharing their Username

As with any membership system, it is possible for one member to signup, and then share their username with someone else; or even post it online for the whole world to see. This is known as username sharing. It is not likely that you'll be attacked in this way, but it's not a bad idea to protect your system; just in case somebody tries this.

s2Member's Simultaneous Login Monitoring will help you prevent a security breach. The rules are simple. A single username can only have X number of simultaneous logins (configurable). Once that limit is reached, s2Member assumes there has been a security breach. At that time, s2Member will place a temporary ban (preventing access) and the offending username will be unable to login until somebody else (who is already logged into the account) has logged-out; clearing the way for someone new.