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To use the management interface, add a line
management 127.0.0.1 23000 stdin
to either the client or the server configuration file. This option instructs OpenVPN to set up the management interface on IP address 127.0.0.1, port 23000, and to use stdin to specify the management password.
We can then use telnet to log in on the management interface
management IP port [pw-file]
Enable a TCP server on IP:port to handle daemon management functions. pw-file, if specified, is a password file (password on first line) or stdin to prompt from standard input. The password provided will set the password which TCP clients will need to provide in order to access management functions.
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Mastering OpenVPN