If you see output like this, then DNS is OK:
$ host 2c8ayxdp1ue4g.internal.endpoint.vpnchecker.corp.ipsy.com 2c8ayxdp1ue4g.internal.endpoint.vpnchecker.corp.ipsy.com has address 10.129.133.74 2c8ayxdp1ue4g.internal.endpoint.vpnchecker.corp.ipsy.com has address 10.129.10.105Otherwise, make sure you are following the most recent VPN setup instructions.