diff -Nur ntp-4.2.0/ntpd/ntp_io.c ntp-4.2.0-errno-fix/ntpd/ntp_io.c
--- ntp-4.2.0/ntpd/ntp_io.c	2003-10-07 23:10:39.000000000 +0200
+++ ntp-4.2.0-errno-fix/ntpd/ntp_io.c	2005-05-06 03:19:47.016523699 +0200
@@ -1757,16 +1757,16 @@
 				   sizeof(rb->recv_space), 0,
 				   (struct sockaddr *)&rb->recv_srcadr,
 				   &fromlen);
-	if (rb->recv_length == 0
+	if (rb->recv_length == 0 || rb->recv_length == -1 && (0
 #ifdef EWOULDBLOCK
 		 || errno==EWOULDBLOCK
 #endif
 #ifdef EAGAIN
 		 || errno==EAGAIN
 #endif
-		 ) {
+		 )) {
 		freerecvbuf(rb);
-	    continue;
+		continue;
 	}
 	else if (rb->recv_length < 0)
 	{