LinuxQuestions.org - strange problem with pptpd and windows clients

I'm running a pptp vpn server on my xen VPS . the only purpose of this vpn is to surf the web anonymously . but I'm getting strange results with windows clients . they can't open some websites, like balatarin.com, mail.yahoo.com or some parts of other sites, like downloading from mediafire.com and etc . I can do all this stuff using linux pptp clients
I tried almost every OS my VPS provider ( kiloserve.com ) has, but still got the same results . I think it must have something to do with xen . anyone have any idea ?

I used this iptables rules for forwarding traffic ( from archlinux wiki )

Code:

iptables -A INPUT -i ppp+ -j ACCEPT

iptables -A OUTPUT -o ppp+ -j ACCEPT



iptables -A INPUT -p tcp --dport 1723 -j ACCEPT

iptables -A INPUT -p 47 -j ACCEPT

iptables -A OUTPUT -p 47 -j ACCEPT



iptables -F FORWARD

iptables -A FORWARD -j ACCEPT



iptables -A POSTROUTING -t nat -o eth0 -j MASQUERADE

iptables -A POSTROUTING -t nat -o ppp+ -j MASQUERADE

here's my pptpd configs

/etc/ppp/pptpd-options

Code:

name pptpd

refuse-pap

refuse-chap

refuse-mschap

require-mschap-v2

require-mppe-128

ms-dns (some dns server)

proxyarp

nodefaultroute

locknobsdcomp

/etc/pptpd.conf

Code:

option /etc/ppp/pptpd-options

logwtmp

localip 192.168.13.1

remoteip 192.168.13.100-200

and in chap-secrets I assign static IPs to each client, in the same range as remoteip