Nope, no difference I have also confirmed the other posters thread that L2TP isnt passing through either

ER8411 Firmware 1.3.3, 1.3.5 and 1.3.6 & ER605 v2 Firmware 2.3.1 – VPN Passthrough issues Testing began on a completely factory reset ER8411 running 1.3.6 – no configs. Not even the initial login...

@mdede I can confirm this with er605v2 2.3.1 AND er8411 1.3.3 and 1.3.6 released to controller today I will do a full write up when I get home In my case external ipsec client to site vpns on macos...

This guide will show you how to properly set up rSTP on Omada L2+ / L3 switches to prevent a network loop causing a cascading total network failure Prerequisits - At least one Full Omada L2+ / L3...

@djwujek your only options are Emergency mode downgrade, or (easier) SSH roll-back, then you can update to release version

@WM1 if you roll the ER605 back to 2.3.0 (has to be done by SSH) does the remote site reconnect? Other things to check - Has your WAN IP changed so the remote site is attempting the port based...