@David-Mc Eventually, after much messing, I scrapped one of my er605s and got a fr205 and that one works using an OpenVPN client/server setup. So no reeal fix except maybe the er605 is faulty

Ignore this one, I just found out that having an L2TP VPN on there caused this.

@GRL Hi I tried that previously and I couldn't get past the error: For an IPsec policy with the same IP address at both ends, the parameters in Phase-1 should be kept the same. As soon as I took out...

@Clive_A I did initially try the site-to-site IPSec option but because I'm behind NAT/dynamic IP address on one site, and the case study in the instructions was based on static IP at both ends, I...

Hi, yes, from the OpenVPN client on my PC, the connection works fine.

@MR.S Thanks for your response. This is the setup for the other er605 that's running the OpenVPN server: