Hello! I have a Sophos SG 310 running UTM 9.501. L2TP over IPsec is configured and working from Mac and Windows laptops, but I cannot figure out how to get it to work on iOS devices. I configured the User Portal and logged into it with an iPhone 7 on iOS 10.3.2, then downloaded the VPN Profile and installed it. When I attempt to connect to the VPN on the iPhone, it almost immediately says "The L2TP-VPN server was unreachable. Verify the server address and try reconnecting." As the VPN works in general, I am not sure where the problem is. Nothing is generated in the IPsec VPN Log during these connection attempts.
I am sure I have overlooked something simple, perhaps, but cannot figure it out. The other threads on this community have not shed any light on my particular situation.
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