diff --git a/pkg/server/admin/admin_test.go b/pkg/server/admin/admin_test.go
index c4c8316..3062ada 100644
--- a/pkg/server/admin/admin_test.go
+++ b/pkg/server/admin/admin_test.go
@@ -218,6 +218,19 @@ func (s *AdminTestSuite) Test_connectClient() {
 	s.cancelFunc()
 }
 
+func (s *AdminTestSuite) Test_connectClientUnknownRendezVousId() {
+	publicId := "abc"
+	serverRes, agentRes := s.agentRegisters(publicId, "abc")
+	s.Nil(serverRes.err)
+	s.Nil(agentRes.err)
+
+	serverToClientRW, _ := s.createPipe()
+
+	_, err := s.admin.AddClient(models.RendezVousId(publicId+"sothatisunknown"),
+		iowrappers.NewSimpleReadWriteAddrCloser(serverToClientRW, testsupport.DummyRemoteAddr("remoteaddr")))
+	s.NotNil(err)
+}
+
 func (s *AdminTestSuite) agentRegistration(agentRW io.ReadWriteCloser) AgentRegisterResult {
 	// verify registration message received
 	agentRegistration, err := comms.ReceiveRegistrationMessage(agentRW)