Cant seem 2 get a internet conection anyone no why???

[tiptop]

tryed setting up my PS3 on live but it keeps saying it can get a internet conection i have the internet conection set on enable etc....and can use the internet search aswell but when i try going into the SIGN UP FOR PLAYSTATION NETWORK it just says a conection 2 the server could not be established and when i try and conection test it says internet conection failed.its also set onto wireless whice is the way im looking it set up.

is ther some other setting i have missed out or something????

thanks in advance for any replys.