Why cant i go on I tunes Store?

[Mathew]

Whenever i go on I tunes store it tells me this

I tunes cannot connect to the I tunes store. The network connection timed out.
Make sure your network settings are correct and your network connection is active.

I don't use Internet Explorer i use Fire Fox. Does it make a difference.

HOW CAN I GET IN
HOW DO I CHECK IF THE NETWORK IS OK