TimmyL
Occasional Visitor
Thank RMerlin, finally self-learned from this site :https://www.vpnuniversity.com/routers/how-to-setup-openvpn-asuswrt-merlin, to manually import the CA certificate back in the Crypto Setting, the VPN client works again.The cipher line is just a warning indicating that you might have issues if your remote end is running a very old version (older than 2.4). Your actual problem lies with the missing Certificate Authority certificate.
Thanks for all the advices from Members here.