diff --git a/src/dns_client.c b/src/dns_client.c
index 11a2a41..f269628 100644
--- a/src/dns_client.c
+++ b/src/dns_client.c
@@ -930,7 +930,8 @@ static int _DNS_client_create_socket_tls(struct dns_server_info *server_info)
 		tlog(TLOG_DEBUG, "enable TCP fast open failed.");
 	}
 
-	setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &yes, sizeof(yes));
+	// ? this cause ssl crash ?
+	// setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &yes, sizeof(yes));
 	
 	if (connect(fd, (struct sockaddr *)&server_info->addr, server_info->ai_addrlen) != 0) {
 		if (errno != EINPROGRESS) {