I use the ER605 ad my gateway for internet but it blocks VPN L2TP connections

from my client pc on LAN.

I was not able to connect to an external VPN L2TP server from my Win10 / Win11 pc,

but if I change the ER605 with my old Cisco RV320 it works !

So the problem seems to be the ER605.... it's the same problem describer here :

https://community.tp-link.com/en/business/forum/topic/667968

Please could you fix with a new firmware ?

Thanks, regards