I need help i cant surf the web

(:SAD) I cant surf my internet is btinternet keep informing me of somthing like 815 tried allsort no go any one can help :THNK

815 - means PC of your internet provider does not respond.
So call to your internet provider (your PC and Comodo are OK)…
Hub (which is in staircase or in attic, garret) is glitching…