diff --git a/src/modules/module-protocol-native.c b/src/modules/module-protocol-native.c
index f6d23cf1e..ad6e53dd5 100644
--- a/src/modules/module-protocol-native.c
+++ b/src/modules/module-protocol-native.c
@@ -285,6 +285,7 @@ process_messages(struct client_data *data)
 			break;
 
 		if (client->core_resource == NULL) {
+			pw_log_debug("%p: no core resource", client);
 			res = -EPROTO;
 			goto error;
 		}
diff --git a/src/modules/module-protocol-native/connection.c b/src/modules/module-protocol-native/connection.c
index ff52929db..efc896dc8 100644
--- a/src/modules/module-protocol-native/connection.c
+++ b/src/modules/module-protocol-native/connection.c
@@ -258,10 +258,12 @@ recv_error:
 	return -errno;
 
 cmsgs_truncated:
+	pw_log_debug("connection %p: cmsg truncated", conn);
 	close_all_fds(&msg, CMSG_FIRSTHDR(&msg));
 	return -EPROTO;
 
 too_many_fds:
+	pw_log_debug("connection %p: too many fds", conn);
 	close_all_fds(&msg, cmsg);
 	return -EPROTO;
 }