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I went through the easy-rsa setup on a server (Ubuntu Desktop) that didn't have OpenVPN on it before. I think everything is set up. However, when I try to start the service (sudo service openvpn start), I get "[fail]". That's it. No messages. Log file is empty (0 bytes). Where should I look for the message on why it is failing?

I am using a bridged configuration. I think I created a tap0 adapter using tunctl, but not sure how to tell.

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for better debugging you need to increase verbosity put 'verb 4' into the config.

ifconfig -a tells if the tap device has been created

post your config to give use more informations

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