Acer Iconia One 7 B1-750 Android tablet (can't establish reliable connection) Pls Help

[Bach0]

The tablet was bought today , before buying it was tested including wifi and everything worked fine.The problem is when we brought it home and connected to home wifi network we lost access to internet, i mean tablet connects to wifi network without any problems and signal strength is excellent, but whenever i try to access internet using chrome,youtube or add new google account it says that " can't establish reliable connection to server "

I am sure that tablet is connected to internet , but something is blocking from accessing it.I searched internet for solution , but couldn't find anything about this specific problem.The similar were when only google account couldn't be added and all other things worked , but in this matter nothing can access internet.I don't know what to do...

I have several PC and phones connected to that wifi network and every single one has internet access.

 

[Bach0]

This solution is very unlogical for me , but set date&time to auto and problem will be gone.My father did it,as well as with his old phone which turns out had the same problem.