diff --git a/src/Libplanet.Net/Transports/NetMQTransport.cs b/src/Libplanet.Net/Transports/NetMQTransport.cs
index c588b7b0e9..391cdcfc14 100644
--- a/src/Libplanet.Net/Transports/NetMQTransport.cs
+++ b/src/Libplanet.Net/Transports/NetMQTransport.cs
@@ -609,6 +609,7 @@ private void ReceiveMessage(object? sender, NetMQSocketEventArgs e)
         {
             try
             {
+                _logger.Debug("{FName} has triggered. {Sender}", nameof(ReceiveMessage), sender);
                 var raw = new NetMQMessage();
 
                 // execution limit to avoid starvation.