Gateway: ER7206 v1.0 on 1.2.0 Build 20220117 Rel.74491 

Controller: OC200 on 1.15.2 Build 20220323 Rel.60717

Unable to connect to L2TP VPN on ER7206 managed by OC200. I get the error "expected SCCRP, received StopCCN". The WAN is a public IP.

Note, an OpenVPN on the same setup works totally fine. Only L2TP has the above problem.

The logs from the client (Mac OS) are located below:

default    11:33:26.983426+0530    pppd    l2tp_get_router_address
default    11:33:26.983792+0530    pppd    l2tp_get_router_address xyz from dict 1
default    11:33:26.986610+0530    pppd    IPSec connection started
default    11:33:27.033294+0530    racoon    IPsec-SA request for xyz queued due to no Phase 1 found.
default    11:33:27.033649+0530    racoon    IPSec Phase 1 started (Initiated by me).
default    11:33:27.157088+0530    racoon    IPSec Phase 1 established (Initiated by me).
default    11:33:28.130076+0530    racoon    IPSec Phase 2 started (Initiated by me).
default    11:33:28.144417+0530    racoon    IPsec-SA established (update): satype=3 spi=0x881e44 mode=1
default    11:33:28.144503+0530    racoon    IPSec Phase 2 established (Initiated by me).
default    11:33:28.144573+0530    racoon    IPsec-SA established (add): satype=3 spi=0xc6f981b0 mode=1
default    11:33:28.144900+0530    pppd    IPSec connection established
default    11:33:26.985066+0530    pppd    L2TP connecting to server 'website' (xyz)...

error       11:33:28.909427+0530    pppd    L2TP received invalid message (expected SCCRP, received StopCCN)