An unknown iTunes error occurred (-50)

Hello there,
I have this error when I want to connect to iTunes Store from my laptop and also the same error appears on my iPhone. I’ve waited for two days hoping that is an error from iTunes but I still cannot establish a connection with Store. Does anyone have any idea what is happening? Is there an error with Store or I have errors in my laptop?
Thank you!

We could not complete your iTunes store request. An unknown error occurred (-50). There was an error in the iTunes Store. Please try again later.
