Exclamation Wifi is not working to play store, help please

I have a local brand android device, Now i brought a new wifi, it was working perfectly at night but now when it connects, a notification appears 'Sign-in into wifi network and then i click to page does not open, its address is

Now other apps like temple run, opera mini, Browser, are connecting to internet but Google Play Store says No Network.
I do not understand what is this and at night there wasnt this sign in thing now help please i dnt kno what to do

My Wifi Dev is Tenda with no password, My mac address is put there on permit.