I recently upgraded from an ER605 to a ER707-M2. I had an L2TP server setup on the ER605 and have the exact same one on the ER707-M2. It worked on the old router and not on the new one. I tried all the port forwarding stuff I can think of, is L2TP just broken on the ER707-M2?  Running latest 1.3.1 Fe.