restart your router.
restart your PC
if it still fails, change the DNS servers on your pc to use different ones e.g. googles public ones at 126.96.36.199 and 188.8.131.52
Alternatively wait 24-48 hours and it might well resolve itself as whatever's changed is propogated correctly
Hi Ionic.i cannot thank you enough for the simple but VERY effective solution.i had no idea that just turning off, and then back on, the router ,could fix it or i would have tried it before! sometimes the simple solutions are the best!
How come it happened in the first place or would that be too technical for me to understand(a mee ewoman,addicted to the internet but doesn't understand computers!!)