A "403 Forbidden' error means that the web server does not have the appropriate permissions to load the required file of your website. If you encounter this error when viewing your site then there's a number of reasons that could be causing this.
The most common reason which we see for this error is due to malicious content being detected. If you are unsure as to whether this is the case, please contact our support team and we'll be able to confirm it and help get your site back online.