PKCSReq (6)           ----------> Cert request goes into queue
                      <---------- CertRep (6) PENDING
CertPoll (6)          ----------> Still pending
                      <---------- CertRep (6) PENDING
CertPoll (6)          ----------> CA issues certificate
                        X-------- CertRep(6) SUCCESS
(Network outage)
(Client reconnects)
PKCSReq (7)           ----------> There is already a valid
                                  certificate with this
				  Distinguished Name (DN).
                      <---------- CertRep (7) FAILURE
                                  Admin revokes certificate
PKCSReq (8)           ----------> CA issues new certificate
                      <---------- CertRep (8) SUCCESS
Client installs certificate