I have recently been getting the above error message, no matter what website i have been trying to access. After doing some troubleshooting I have realized this is being caused by my AVG. When i disable it, i have no problems, as soon as it's re-enabled I'm getting the error messages again.
I have done the update, i seen a suggestion from AVG on a previous thread, i have enabled internet sharing (again, i seen this on another thread) but it's not clearing the issue. I've just renewed my subscription to AVG which is now completely useless as i need to keep it disabled to use the internet