I have a PPTP daemon V1.3.4 running on a CentOS server.
My client connections come from both Linux and Windows machines. When PPTP connection is active, the clients are unable to download full web pages from many websites (stackoverflow, twitter, ip-lookup for example). For some other websites, the clients are not even able to ping the IP address (imgur.com for example).
However they are able to download full web pages of Facebook, Youtube for example.
The CentOS server itself is able to download full web pages from all the web sites. It does not have any iptable rules despite a few masquerade rules in NAT table.
Please help, thanks.