Your problem seems to be similar to my: http://forum.mikrotik.com/t/l2tp-problem/59466/1 - looks like VPN servers are little bit screwed. There is also solution for recovery in my posts recommended by support.
Your problem seems to be similar to my: http://forum.mikrotik.com/t/l2tp-problem/59466/1 - looks like VPN servers are little bit screwed. There is also solution for recovery in my posts recommended by support.