I'm setting up my router's VPN server and as part of the setup I accidentally generated a certificate with incorrect parameters.  I corrected the parameters and generated another certificate.  When I export the configuration file it appears to have two certificates in the configuration file - presumably the original erroneous one, followed by the corrected one.  I suspect this file will not work to set up remote clients, so I want to delete all certificates/configurations from my router and start over.  How can I do that?