In my country some websites like twitter,youtube,facebook etc are blocked by government and we have to use VPN so we can access them, but somehow after I connect to VPN (openvpn and PPTP both have this problem) I can ping these websites and can resolve them with nslookup , but when it comes to browsers like chrome and firefox I can't browse some of them.
It's really interesting , I can browse youtube perfectly , but twitter won't load complete (here) , facebook doesn't load at all (there are some other websites that won't load at all like facebook)
I tried removing the cache of browsers and even with new and fresh installing without any caching this problem appears
I change the DNS with
PS: I can all websites with their Domain Names