I am trying to connect to our office L2TP IPSec VPN that I’ve setup in the Balance 580. I am able to connect if I am directly connected to our ISP’s router(can’t change it to bridged mode) but I am unable to connect if I go through my Balance 380 that I have after my ISP’s router.
I have noticed in the active sessions that the ISAKMP protocol seems to stop or idle right away whenever I try to connect to the L2TP VPN from my PC. I am not sure what rule or option is blocking the protocol but I am sure that the VPN is working correctly as I was able to connect if I am not going through the balance 380 as stated earlier.
Home setup: ISP router - > Balance 380 -> unmanaged switch - > PC(s)