Can't establish a reliable connection to the server google play?

Ok so i have samsung galaxy s3 i rooted it a week ago and it worked flawless then afterward when today i opened google play it says no connection .i tried all methods like setting date and time cleaned data and cache but nothing orked the last option i was left with was factory reset i did it but nothing worked when it restarted it asked for google account and when i tried to sign in it prompt saying cant establish a reliable connection .Now when i researched more about it i came to know about a file hosts and to edit it i installed total commander when i tried to edit it it closed saying not enough memory but when i opened it with es file explorer it opened when i put a # mark before everything and saved it it gives an error saying it cannot be save file size of hosts is 1.1mb please help any help will be appreciated