diff --git a/itests/clients/node_client.go b/itests/clients/node_client.go
index 028f97d00..1e6002694 100644
--- a/itests/clients/node_client.go
+++ b/itests/clients/node_client.go
@@ -284,8 +284,8 @@ func (c *NodesClients) SynchronizedWavesBalances(
 }
 
 func (c *NodesClients) Handshake() {
-	c.GoClient.Handshake()
-	c.ScalaClient.Handshake()
+	c.GoClient.Connection.SendHandshake()
+	c.ScalaClient.Connection.SendHandshake()
 }
 
 func (c *NodesClients) SendToNodes(t *testing.T, m proto.Message, scala bool) {
@@ -300,8 +300,10 @@ func (c *NodesClients) SendToNodes(t *testing.T, m proto.Message, scala bool) {
 }
 
 func (c *NodesClients) Close(t *testing.T) {
-	c.GoClient.Close(t)
-	c.ScalaClient.Close(t)
+	c.GoClient.GRPCClient.Close(t)
+	c.GoClient.Connection.Close()
+	c.ScalaClient.GRPCClient.Close(t)
+	c.ScalaClient.Connection.Close()
 }
 
 func (c *NodesClients) requestNodesAvailableBalances(
diff --git a/pkg/networking/session.go b/pkg/networking/session.go
index 6cfc79e73..bdab4bdd4 100644
--- a/pkg/networking/session.go
+++ b/pkg/networking/session.go
@@ -348,7 +348,7 @@ func (s *Session) readMessagePayload(hdr Header, conn io.Reader) error {
 		s.logger.Debug("Invoking OnReceive handler", "message",
 			base64.StdEncoding.EncodeToString(s.receiveBuffer.Bytes()))
 	}
-	s.config.handler.OnReceive(s, bytes.NewReader(s.receiveBuffer.Bytes())) // Invoke OnReceive handler.
+	s.config.handler.OnReceive(s, s.receiveBuffer) // Invoke OnReceive handler.
 	return nil
 }
 
diff --git a/pkg/networking/session_test.go b/pkg/networking/session_test.go
index 745ee194b..c30bfac81 100644
--- a/pkg/networking/session_test.go
+++ b/pkg/networking/session_test.go
@@ -56,7 +56,7 @@ func TestSuccessfulSession(t *testing.T) {
 			require.NoError(t, wErr)
 			assert.Equal(t, 5, n)
 		})
-		sc2 := serverHandler.On("OnReceive", ss, bytes.NewReader(encodeMessage("Hello session"))).
+		sc2 := serverHandler.On("OnReceive", ss, bytes.NewBuffer(encodeMessage("Hello session"))).
 			Once().Return()
 		sc2.NotBefore(sc1).
 			Run(func(_ mock.Arguments) {
@@ -75,7 +75,7 @@ func TestSuccessfulSession(t *testing.T) {
 		require.NoError(t, wErr)
 		assert.Equal(t, 17, n)
 	})
-	cl2 := clientHandler.On("OnReceive", cs, bytes.NewReader(encodeMessage("Hi"))).Once().Return()
+	cl2 := clientHandler.On("OnReceive", cs, bytes.NewBuffer(encodeMessage("Hi"))).Once().Return()
 	cl2.NotBefore(cl1).
 		Run(func(_ mock.Arguments) {
 			cWG.Done()