[all variants] pptp vpn issues with mac

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http://ubuntuforums.org – I had recenetly setup a pptp vpn server on centos 5.8 .. every thing is working fine. i can coonect perfect ok from a windows machine and works great but one vpn user has a mac notebook MacBook Pro os is X lion 10.7.5 it connects fine but I cannot do a RDP to a windows 7 machine But if this win7 machine is given a public ip I can remote desktop from the same mac notebook to the ip and it works fine my error logs show ------------------ pppd 2.4.4 started by root, uid 0 Feb 4 13:32:56 kmchat pppd[14979]: Using interface ppp0 Feb 4 13:32:56 kmchat pppd[14979]: Connect: ppp0 <--> (Hardware)