diff --git a/cmd/osnadmin/main.go b/cmd/osnadmin/main.go
index c13b2775fea..9d331946370 100644
--- a/cmd/osnadmin/main.go
+++ b/cmd/osnadmin/main.go
@@ -42,9 +42,9 @@ func executeForArgs(args []string) (output string, exit int, err error) {
 	//
 	app := kingpin.New("osnadmin", "Orderer Service Node (OSN) administration")
 	orderer := app.Flag("orderer-address", "Admin endpoint of the OSN").Short('o').Required().String()
-	caFile := app.Flag("ca-file", "Path to file containing PEM-encoded TLS CA certificate(s) for the OSN").Required().String()
-	clientCert := app.Flag("client-cert", "Path to file containing PEM-encoded X509 public key to use for mutual TLS communication with the OSN").Required().String()
-	clientKey := app.Flag("client-key", "Path to file containing PEM-encoded private key to use for mutual TLS communication with the OSN").Required().String()
+	caFile := app.Flag("ca-file", "Path to file containing PEM-encoded TLS CA certificate(s) for the OSN").String()
+	clientCert := app.Flag("client-cert", "Path to file containing PEM-encoded X509 public key to use for mutual TLS communication with the OSN").String()
+	clientKey := app.Flag("client-key", "Path to file containing PEM-encoded private key to use for mutual TLS communication with the OSN").String()
 
 	channel := app.Command("channel", "Channel actions")
 
@@ -63,21 +63,31 @@ func executeForArgs(args []string) (output string, exit int, err error) {
 	//
 	// flag validation
 	//
-	osnURL := fmt.Sprintf("https://%s", *orderer)
-
-	caCertPool := x509.NewCertPool()
-	caFilePEM, err := ioutil.ReadFile(*caFile)
-	if err != nil {
-		return "", 1, fmt.Errorf("reading orderer CA certificate: %s", err)
-	}
-	err = comm.AddPemToCertPool(caFilePEM, caCertPool)
-	if err != nil {
-		return "", 1, fmt.Errorf("adding ca-file PEM to cert pool: %s", err)
-	}
+	var (
+		osnURL        string
+		caCertPool    *x509.CertPool
+		tlsClientCert tls.Certificate
+	)
+	// TLS enabled
+	if *caFile != "" {
+		osnURL = fmt.Sprintf("https://%s", *orderer)
+		var err error
+		caCertPool = x509.NewCertPool()
+		caFilePEM, err := ioutil.ReadFile(*caFile)
+		if err != nil {
+			return "", 1, fmt.Errorf("reading orderer CA certificate: %s", err)
+		}
+		err = comm.AddPemToCertPool(caFilePEM, caCertPool)
+		if err != nil {
+			return "", 1, fmt.Errorf("adding ca-file PEM to cert pool: %s", err)
+		}
 
-	tlsClientCert, err := tls.LoadX509KeyPair(*clientCert, *clientKey)
-	if err != nil {
-		return "", 1, fmt.Errorf("loading client cert/key pair: %s", err)
+		tlsClientCert, err = tls.LoadX509KeyPair(*clientCert, *clientKey)
+		if err != nil {
+			return "", 1, fmt.Errorf("loading client cert/key pair: %s", err)
+		}
+	} else { // TLS disabled
+		osnURL = fmt.Sprintf("http://%s", *orderer)
 	}
 
 	var marshaledConfigBlock []byte
diff --git a/cmd/osnadmin/main_test.go b/cmd/osnadmin/main_test.go
index 2fa9ea9cb1a..40840c858fd 100644
--- a/cmd/osnadmin/main_test.go
+++ b/cmd/osnadmin/main_test.go
@@ -87,8 +87,12 @@ var _ = Describe("osnadmin", func() {
 	})
 
 	JustBeforeEach(func() {
-		testServer.TLS = tlsConfig
-		testServer.StartTLS()
+		if tlsConfig != nil {
+			testServer.TLS = tlsConfig
+			testServer.StartTLS()
+		} else {
+			testServer.Start()
+		}
 
 		u, err := url.Parse(testServer.URL)
 		Expect(err).NotTo(HaveOccurred())
@@ -196,6 +200,62 @@ var _ = Describe("osnadmin", func() {
 				checkOutput(output, exit, err, 404, expectedOutput)
 			})
 		})
+
+		Context("when TLS is disabled", func() {
+			BeforeEach(func() {
+				tlsConfig = nil
+			})
+
+			It("uses the channel participation API to list all channels", func() {
+				args := []string{
+					"channel",
+					"list",
+					"--orderer-address", ordererURL,
+				}
+				output, exit, err := executeForArgs(args)
+				Expect(err).NotTo(HaveOccurred())
+				Expect(exit).To(Equal(0))
+
+				expectedOutput := types.ChannelList{
+					Channels: []types.ChannelInfoShort{
+						{
+							Name: "participation-trophy",
+							URL:  "/participation/v1/channels/participation-trophy",
+						},
+						{
+							Name: "another-participation-trophy",
+							URL:  "/participation/v1/channels/another-participation-trophy",
+						},
+					},
+					SystemChannel: &types.ChannelInfoShort{
+						Name: "fight-the-system",
+						URL:  "/participation/v1/channels/fight-the-system",
+					},
+				}
+				checkOutput(output, exit, err, 200, expectedOutput)
+			})
+
+			It("uses the channel participation API to list the details of a single channel", func() {
+				args := []string{
+					"channel",
+					"list",
+					"--orderer-address", ordererURL,
+					"--channel-id", "tell-me-your-secrets",
+				}
+				output, exit, err := executeForArgs(args)
+				Expect(err).NotTo(HaveOccurred())
+				Expect(exit).To(Equal(0))
+
+				expectedOutput := types.ChannelInfo{
+					Name:              "asparagus",
+					URL:               "/participation/v1/channels/asparagus",
+					ConsensusRelation: "broccoli",
+					Status:            "carrot",
+					Height:            987,
+				}
+				checkOutput(output, exit, err, 200, expectedOutput)
+			})
+		})
 	})
 
 	Describe("Remove", func() {
@@ -237,6 +297,25 @@ var _ = Describe("osnadmin", func() {
 				checkOutput(output, exit, err, 404, expectedOutput)
 			})
 		})
+
+		Context("when TLS is disabled", func() {
+			BeforeEach(func() {
+				tlsConfig = nil
+			})
+
+			It("uses the channel participation API to remove a channel", func() {
+				args := []string{
+					"channel",
+					"remove",
+					"--orderer-address", ordererURL,
+					"--channel-id", channelID,
+				}
+				output, exit, err := executeForArgs(args)
+				Expect(err).NotTo(HaveOccurred())
+				Expect(exit).To(Equal(0))
+				Expect(output).To(Equal("Status: 204\n"))
+			})
+		})
 	})
 
 	Describe("Join", func() {
@@ -391,6 +470,31 @@ var _ = Describe("osnadmin", func() {
 				checkOutput(output, exit, err, 405, expectedOutput)
 			})
 		})
+
+		Context("when TLS is disabled", func() {
+			BeforeEach(func() {
+				tlsConfig = nil
+			})
+
+			It("uses the channel participation API to join a channel", func() {
+				args := []string{
+					"channel",
+					"join",
+					"--orderer-address", ordererURL,
+					"--channel-id", channelID,
+					"--config-block", blockPath,
+				}
+				output, exit, err := executeForArgs(args)
+				expectedOutput := types.ChannelInfo{
+					Name:              "apple",
+					URL:               "/participation/v1/channels/apple",
+					ConsensusRelation: "banana",
+					Status:            "orange",
+					Height:            123,
+				}
+				checkOutput(output, exit, err, 201, expectedOutput)
+			})
+		})
 	})
 
 	Describe("Flags", func() {