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If you're seeing a payment error page while browsing, this means there is a payment issue with the DNSFilter account and dns resolution is blocked due to the issue. 

This is not the same as policy Block Pages—which contain a blocked domain, the policy name that's performing the block, and often the blocked category—but instead indicate a misconfiguration or network issue.

We are unable to service your request. In order to access the Internet, please log in to your content filtering dashboard or contact support to resolve this issue.

This is the payment issue error page, which means there is an issue with account billing. 

Log in to your DNSFilter dashboard to resolve the billing issue or contact the DNSFilter Support team for assistance.