You have some problem with your network or ISP? Let Setup your VPN Server in other Network to resolved this. Step 1. Install PPTPD on CentOS 5 & 6 #yum install ppp #cd /usr/local/src #wget http://poptop.sourceforge.net/yum/stable/packages/pptpd-1.3.4-2.rhel5.x86_64.rpm #rpm -Uhv pptpd-1.3.4-2.rhel5.x86_64.rpm Step 2. Edit IP setttings in /etc/pptpd.conf #vi /etc/pptpd.conf Press Insert [...]

Eg: VPN Server IP 192.168.0.1 VPN Centos client: # route del default # route add default gw 192.168.0.1 VPN Ubuntu client: #su route del default #su route add default gw 192.168.0.1 re-check your ip and done.