Oh so frustrating for me...
Previously, it took me about a month of hours per day before I was able to get a VPN setup working in RT-AC66R with Merlin ASUS-wrt and its OpenVPN server, and clients in tablets and phone using OpenVPN Connect app.
Finally it was working!
But during all my efforts to get that going, someone in a forum INSISTED that I needed to change from 192.160.0.0 home net to something different because eventually I would connect from a remote site using the same local net, and everything would be messed up. I didn't then, plannig to do it "at an opportune time."
So today I made that change--and at the same time did a factory reset on the router, because having reloaded a new Merlin firmware a few days ago (after which VPN still worked) again someone insisted I must do a factory reset, necessitating reenter all router configs (store config and restore not good if it is a several version jump).
I made screen captures of all the configs, and copied/saved all of the certs and keys from the five boxes in the server config screen. Then put all those back in.
Server refuses to start!
Help? I am a techie from back when, but know next to zero about VPN... Muddled through it before, and as I said, it took a month of fiddling to get it going.
Here is log
Jul 23 15:15:08 rc_service: httpd 268:notify_rc restart_chpass;restart_vpnserver1
Jul 23 15:15:08 kernel: tun: Universal TUN/TAP device driver, 1.6
Jul 23 15:15:08 kernel: tun: (C) 1999-2004 Max Krasnyansky <
maxk@qualcomm.com>
Jul 23 15:15:08 kernel: device tun21 entered promiscuous mode
Jul 23 15:15:11 openvpn[646]: OpenVPN 2.3.7 mipsel-unknown-linux-gnu [SSL (OpenSSL)] [LZO] [EPOLL] [MH] [IPv6] built on Jul 16 2015
Jul 23 15:15:11 openvpn[646]: library versions: OpenSSL 1.0.2d 9 Jul 2015, LZO 2.08
Jul 23 15:15:11 openvpn[648]: PLUGIN_INIT: POST /usr/lib/openvpn-plugin-auth-pam.so '[/usr/lib/openvpn-plugin-auth-pam.so] [openvpn]' intercepted=PLUGIN_AUTH_USER_PASS_VERIFY
Jul 23 15:15:12 openvpn[648]: Diffie-Hellman initialized with 2048 bit key
Jul 23 15:15:12 openvpn[648]: Error: private key password verification failed
Jul 23 15:15:12 openvpn[648]: Exiting due to fatal error
