Consider my typical home network, consisting of a cable ISP and retail LinkSys WiFi router.
My iPhone automatically joins the WiFi network when it’s in range. Installed on the iPhone is ProtonVPN, client software for a popular VPN provider.
The VPN client connects “on demand” and for the most part works flawlessly.
All connections over the VPN fail when the iPhone is used from a particular room in my home.
Using another VPN client (e.g. OpenVPN) or even a different VPN provider all together (e.g. BraveVPN) triggers the same problem.
The room in question has a concrete wall in the router-facing direction, so naturally one would assume that the WiFi signal is having trouble penetrating the wall, and perhaps I need a range extender of some sort.
Except that, while standing in the room in question…
- The WiFi signal indicator shows full strength.
- Manually disabling the VPN allows full connectivity to resume.
- SpeedTest.net with VPN disabled shows 50ms latency, 80Mbps down, and
10 Mbps up. The connection is totally solid from that room.
It’s only when the VPN is connected (any VPN, not just ProtonVPN) that connectivity is hindered, and only in that one room.
I’m familiar with the idea of a firewall blocking outbound VPN connections, but this case is unusual insofar as the connection seems to blocked by a physical wall.
Any idea what would cause an odd problem like this to manifest and how one would fix it?