[HELP] Cannot add google account - can't establish reliable connection

I have been using my XT926 for some months in the UK now and have to say its a brilliant phone. Since yesterday however i have been unable to sync anything related to google (gmail, contacts, etc). I had rooted a little over a week ago so thinking something had gone wrong i performed a factory reset. The reset went fine and the phone booted up to a stock state but when it came to adding my google account i got the error "cant establish a reliable connection to the server...". At first i figured this must be a connection issue but after loading up the web browser i'm able to load all sites including google web mail so my connection is perfectly fine. I then got hold of my galaxy tab 2 and checked my google sync status on there - it was working fine. I'm now sat here with a phone that has no google services and i'm wondering what has gone wrong ? I've searched online and many have similar problems where clearing the cache or factory resetting has solved it but in my case this hasnt helped. Any ideas ?

StefanGA said:

checked this thread already, I assume!?

http://xdaforums.com/showthread.php?t=2110225

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Hi Stefan, I hadnt seen that thread prior to you linking it so havent tried the solution. I'll re-root my device and give it a go but after factory resetting i'm sceptical to this working. Something would appear to be seriously wrong with my phone.

Hi Stefan,
Just wanted to say thanks for pointing me in the right direction. Rooted, deleted hosts file and all is working again. I guess the factory reset didnt restore the hosts file from when i previously rooted. I'm just happy to have this amazing phone back working again !