VPN pptp Can Connect Once, Won't Connect to Server Twice?

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http://serverfault.com – tried in two different networks and multiple clients both Windows and Mac. It seems like when I reboot the VPN server it allows any client to connect once and second client connection gets error from any client. I setup pptpd on CentOS6.3, I m testing it, I can connect to the server the first time after reboot. Then I disconnect my from client to test the connection again, but it won't connect to the VPN second time I really dont get it. Here is /var/log/messages for you... Nov 30 23:28:56 test pptpd[1221]: MGR: Maximum of 100 connections reduced to 6, not enough IP addresses given Nov (HowTos)