It's probably the dns server you are using. Try changing your DNS to manual and use 4.2.2.1 & 4.2.2.2 in your tcp/ip settings of your computer. It will probably be set to automatic and will therefore pickup the ones on your router. If it is then the ones on your router will be the ones your ISP has set and if you are in Turkey it will probably block it.
It is in the image below, change from automatic to manual then change the dns to 4.2.2.1 & 4.2.2.2. I am in Turkey next week and will check it myself.