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I've set up a L2TP/IPSec VPN server with pre-shared keys, and everything works fine when I connect to the VPN manually.

However, when it's set to be the always-on VPN, everything changed. It seemd that no traffic was sent to the Internet anymore. If I opened a URL, the browser would return Error code: ERR_CONNECTION_REFUSED.

Is there anything wrong with my configuration of my phone or the VPN server?

I'm running android 4.4.4 with a recent CM nightly build.

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  • After upgrading to lollipop, always-on vpn just works... FYI
    – pallxk
    Jan 8, 2015 at 6:32

1 Answer 1

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I think the problem is an bug in android kitkat listet as Issue 64819.

it says:

Android 4.4 VPN: DNS request packets' source IP address is always private address

A packet capture shows that the DNS packets are sent out of the public interface, as expected, but source IP address is the VPN-assigned private address, which is not publicly routable.

This issues does not occur on Android 4.3.

see here: https://code.google.com/p/android/issues/detail?id=64819

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