diff --git a/protocol/etch/engine.go b/protocol/etch/engine.go
index 0bb35dc..876f3b8 100644
--- a/protocol/etch/engine.go
+++ b/protocol/etch/engine.go
@@ -40,6 +40,7 @@ func (s *Server) Run() error {
 		for {
 			n, addr, err := conn.ReadFromUDP(buf)
 			if err != nil {
+				log.Println("main:", err)
 				break
 			}
 			log.Println(addr, string(buf[:n]))