I am facing this problem which leaves the error message

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'Auth' password cannot be read from a file

Because I have set configuration like this in the .opvn file.

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auth-user-pass user_password.config

And after I googled I found one solution. It says You should recomiple the openVPN. Then I did as it said. It works.
Now Go into the openvpn folder. and follow the below.

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./configure --enable-password-save
make
sudo make install

Others

• Guide to Firewalls and VPNs