Dear All,
I want to disable multiple login of same account on PPTP server .
now , 1 user can conect multiple login with other device.
please help me.
This looks like a technical support request.
This site is for the co-ordination of the Ubuntu project(s), and other non-support matters. For Ubuntu Support options, please have a look at https://community.ubuntu.com/t/finding-help/709
(It turns out you have already asked on support sites)