openvpn issue avoid simultaneous access

Solution 1:

The default behavior of OpenVPN is that you cannot use the same certificate simultaneously from multiple computers. If you initiate a new connection with a certificate that's already in use, the existing connection will be dropped.

If you want to support simultaneous connections with the same certificate you need to enable the duplicate-cn option in your configuration. From the man page:

   --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.