@Flysky I had exactly same problem (ISP Vodafone Czechia, exUPC network, modem Vodafone Station TG 3442). Putting a switch between the modem and router resolved the issue.

@PackersOwner too many bugs so they removed it. After trying 2.2.0, 2.1.3 and 2.1.4, all of them have problem with connections between VPN clients so at the moment I'm sticking with 2.1.2. If you...

@Clive_A I think you didn't understand the topology what I said, I don't think the er605 can not handle this to establish connection between PC2 and PC3

@Clive_A on er605 we run both ovpn and l2tp server, PC1 in local LAN, PC2 as ovpn client and PC3 as l2tp client. With firmware 2.1.2 and older, all PCs can see each other, but from 2.1.3 PC2 and PC3...

@Hank21 all 3 lastest firmwares (2.1.3, 2.1.4 and 2.2.0) have problem with connection between VPN clients: OpenVPN client can not connect to l2tp client. I have to roll back to 2.1.2 firmware.

@Springs42 try clear the cache or open the page in private mode. Scared me a while too with password incorrect warning.