if you can access using your PC but not your laptop then definitely something wrong with your laptop
for the first
have you try to clear cache your browser?
try different browser?
403 indicating that our sites is forbidden to be accessed.
try to check firewall or antivirus setting, or maybe proxy
is it your laptop and your PC share same network?
the only thing that could be happen is that your laptop's IP caught in our server security and blocked
but this will happen in your case, if your laptop and your PC using different network (IP address)