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Proxy filtering is a technique used by VPN providers to prevent users from bypassing their usual internet usage restrictions by using proxy servers. Proxy servers are servers which are specifically configured to act as intermediaries between the user and the outside world.

By intercepting all traffic destined for a proxy server, VPN providers can ensure that only authorised traffic is transmitted to the proxy server.

This prevents users from circumventing the security and privacy features of the VPN by using a proxy server to access the internet. However, proxy filtering may also have other negative consequences.

For example, if a user is prevented from accessing a website which is blocked by their VPN provider, they may be unable to access content which is legally permissible.

Proxy filtering can also have a negative impact on the performance of a VPN. By intercepting all traffic, VPN providers can slow down the overall performance of the network by processing all traffic.

In some cases, this may be unavoidable, but it is important to be aware of the potential implications.

Overall, proxy filtering is a useful tool which can help to protect users from malicious actors and unauthorized access to their online activities. However, it should be used with caution, as it may have unintended consequences.