diff --git a/packages/net/_test.pony b/packages/net/_test.pony
index ea362ce46a..499f966d23 100644
--- a/packages/net/_test.pony
+++ b/packages/net/_test.pony
@@ -458,6 +458,9 @@ class \nodoc\ _TestTCPMuteReceiveNotify is TCPConnectionNotify
     _h.complete(false)
     true
 
+  fun ref closed(conn: TCPConnection ref) =>
+    printf("_TestTCPMuteReceiveNotify closed\n".cstring())
+
   fun ref connect_failed(conn: TCPConnection ref) =>
     _h.fail_action("receiver connect failed")
 
@@ -491,6 +494,9 @@ class \nodoc\ _TestTCPMuteSendNotify is TCPConnectionNotify
      _h.complete_action("sender sent data")
      true
 
+  fun ref closed(conn: TCPConnection ref) =>
+    printf("_TestTCPMuteSendNotify closed\n".cstring())
+
 class \nodoc\ iso _TestTCPUnmute is UnitTest
   """
   Test that the `unmute` behavior will allow a connection to start reading
diff --git a/src/libponyrt/lang/socket.c b/src/libponyrt/lang/socket.c
index edffd4bd95..7be4a53824 100644
--- a/src/libponyrt/lang/socket.c
+++ b/src/libponyrt/lang/socket.c
@@ -385,6 +385,7 @@ static bool iocp_recv(asio_event_t* ev, char* data, size_t len)
   {
     if(GetLastError() != WSA_IO_PENDING)
     {
+      printf("iocp_recv error: %ld\n".cstring(), GetLastError());
       iocp_destroy(iocp);
       return false;
     }