Definition of common name for OpenVPN clients

boolean.is.null

I'm currently going through the OpenVPN manual, to determine which options would be reasonable for me and which are not.

I've come across the following server option:

--duplicate-cn
Allow multiple clients with the same common name to concurrently connect. In the absence of this option,
OpenVPN will disconnect a client instance upon connection of a new
client having the same common name.

How is the clients common name defined?

TinCanTech

Most commonly by the client certificate or else as the client user name when user/pass is used.

boolean.is.null

TinCanTech wroteMost commonly by the client certificate or else as the client user name when user/pass is used.

Thanks for the quick answer!