Help me about VPN Windows (Clients to Site) via PPTP

Hi,

My company use VPN Windows via PPTP, I configured VPN Server and users can connect via VPN to work out my office.

But, I have a problem about VPN. I have a site, include 2 users, the first user connect VPN, the second user also connect VPN, When I disconnect VPN of the first user, the second user also disconnect. However, If I disconnect the second user, the first user still connect VPN.

Please help me about solutions to fix this problem.

Thanks,

NCN