Firstly, check whether the particular website itself is experiencing technical difficulties. Try using Down for everyone or just me.
Some websites may have started restricting access based on geographical region or limit access based on the number of requests it receives from one IP address. You may like to do a search to see if the website has any such policy or if any other website users have encountered similar issues.
If the website appears to be running normally and you're unable to access it, make a note of the error message you see on your browser and contact us on Live Chat so we can try some troubleshooting options.