I am getting an Error 403 - a "forbidden" error when trying to access my eBook in VitalSource.

This could be due to your location. Try connecting to a different network e.g. house/school/work or public coffee place. This will show whether there is a firewall or network restricting traffic to your device.

Your Internet Source Provider (ISP) could be blocking the following:

.vitalbook.com

.vitalsource.com

.cloudfront.net

.googleapis.com

You may need to use a Virtual Private Network (VPN) to make sure nothing in the network where you are located is blocking ports/IP addresses.

If the problem continues, please contact our IT support team at isservicedesk@napier.ac.uk.