Thanks, Drew. I still can't seem to get it to work.
I tried changing the host to opvn.sonic.net and get this error message sequence, as expected.
Client: RECONNECTING init_instance Local Address:
The upper right shows the following:
Firmware: DD-WRT v3.0-r37305 std (10/10/18)
Time: 22:27:16 up 8:39, load average: 0.05, 0.03, 0.00
WAN IP: 220.127.116.11
I tried rebooting the router, but it doesn't help.
For some reason, it now looks like the router is having DNS or connectivity issues, at least with regards to the VPN connection.
The log line "20190613 22:22:49 N RESOLVE: Cannot resolve host address: opvn.sonic.net:1194 (Name does not resolve)" indicates that it can't resolve the VPN server's IP address so it's not even able to attempt a connection now.
You can try changing the host to 18.104.22.168 temporarily to see if it connects, but long term it would be preferred to have it resolve the hostname.