diff --git a/src/raw_sock.c b/src/raw_sock.c
index 43cd70a..4dc1c7a 100644
--- a/src/raw_sock.c
+++ b/src/raw_sock.c
@@ -74,6 +74,10 @@
 	int ret;
 	int retval = 0;
 
+
+	if (!(conn->flags & CO_FL_CTRL_READY))
+		return 0;
+
 	errno = 0;
 
 	/* Under Linux, if FD_POLL_HUP is set, we have reached the end.
@@ -189,6 +193,9 @@
 {
 	int ret, done;
 
+	if (!(conn->flags & CO_FL_CTRL_READY))
+		return 0;
+
 	done = 0;
 	while (pipe->data) {
 		ret = splice(pipe->cons, NULL, conn->t.sock.fd, NULL, pipe->data,
@@ -234,6 +241,9 @@
 	int ret, done = 0;
 	int try = count;
 
+	if (!(conn->flags & CO_FL_CTRL_READY))
+		return 0;
+
 	errno = 0;
 
 	if (unlikely(!(fdtab[conn->t.sock.fd].ev & FD_POLL_IN))) {
@@ -331,6 +341,9 @@
 {
 	int ret, try, done, send_flag;
 
+	if (!(conn->flags & CO_FL_CTRL_READY))
+		return 0;
+
 	done = 0;
 	/* send the largest possible block. For this we perform only one call
 	 * to send() unless the buffer wraps and we exactly fill the first hunk,