Good day, I have a 1941 router where I manage to connect some roadwarriors using L2TP over IPSec and it works perfectly up to 15.3.2T release.
After upgrading to 15.3.3M I am unable to have L2TP over IPSec working, while pure LAN to LAN IPSec still works perfectly (I have some tunnels to branch offices).
I have performed some debugs and I can get exactly the same messagges as 15.3.2T, I have captured all the packets on my computer and while on 15.3.2T I notice normal ESP traffic after ISAKMP, on 15.3.3M I only capture ESP packets from my PC to the 1941 and not any packet from 1941 and my PC.
Both show crypto isakmp sa and show crypto ipsec sa show active SAs between my PC and the 1941 so it seems that it's not a matter of IPSec, another test I need to perform is disabling one of the two WAN interfaces and leaving enabled only the one that I want to connect to.
Did you have any similar problem and can you share any information? Thanks in advance.