VPN network extension not working after 15.1.1 upgrade

ScottBonar wrote:

Our company has a VPN client that we develop and it works on 14.x and it was working on 15.x but ever since I have upgraded to 15.1.1, I do not see any traffic being sent to the TUN interface even though I have it configured as the default route. Can anyone provide guidance or insight into what might have changed around the Network Extensions that could have caused this?

Unfortunately I cannot tell if this was happening on 15.0.1. Some things I have tried, to no avail, is disable the firewall and uninstalling/installing of the VPN client. I have no other filters installed that could be interfering. When I try and ping an address I should be able to reach, I get "no route to host"

NOTE, networking works fine when the VPN client is not connected.

Your IT department may need to update something on their end. Have you talked to them yet?

when you install VPN it configures itself to the specific hardware, iOS version and network that the phone uses. If any of those change it can break the VPN. So any time you change any of these you may need to delete the VPN app and profile, restart your phone then add them back so it can configure itself to the new environment.

Try turning off the Firewall in Sequoia

ScottBonar wrote:

Not iOS related

Yes, but the same thing applies to every operating system; MacOS, WindowsOS, Linux, Android. VPN may need to be reinstalled after any software or hardware update.