PKCSReq (3)           ----------> Cert request goes into queue
                      <---------- CertRep (3) PENDING
CertPoll (3)          ----------> Still pending
                        X-------- CertRep(3) PENDING
(Network outage)
(Client reconnects)
PKCSReq (4)           ---------->
                      <---------- CertRep (4) PENDING
etc...