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This blog post is 8 years old and may be out of date.

IP exposure via UDP ports


We have recently become aware of a newly published method for deanonymizing VPN users. For this to work, the user must be running some software that listens to and communicates via a UDP port and either be connecting directly to the internet without a NAT router or be behind a NAT router with port forwarding enabled.

You can read more about the issue and how to mitigate it.