We're sorry to know this. Could you please share the screenshot of the access denied error message to investigate further? Refer to this article for the steps to capture the screenshot. You can post the screenshot here on your topic. Click on 'Answer' & then click on the 'Image' [mountain symbol] & follow the instructions. Thank you.
To resolve this on my iPhone/iPad i had to go into: Settings VPN Under PERSONAL VPN, click on info of AVG Mobile Security, & Deselect: Connect on Demand
This resolved my problem
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