Error help ! What does it mean?

[j0yful]

Suddenly this message popped up "safari could not open this page. Operation could not be completed (kCFErrorDomainCFNetworkerror303) . Now, what does this mean? Should I be worried?

 

[IPad-Fan-64]

I havnt come across that problem, have you checked the apples website FAQ? Might be something there.