- Fix #1254: send failed: Socket is not connected and

`remote address is 0.0.0.0 port 53`.

doc/Changelog

@@ -1,3 +1,7 @@
+24 March 2025: Wouter
+	- Fix #1254: `send failed: Socket is not connected` and
+	  `remote address is 0.0.0.0 port 53`.
+
 21 March 2025: Wouter
 	- Fix #1253: Cache entries fail to be removed from Redis cachedb
 	  backend with unbound-control flush* +c.

util/netevent.c

@@ -369,6 +369,15 @@ udp_send_errno_needs_log(struct sockaddr* addr, socklen_t addrlen)
 		(struct sockaddr_storage*)addr, addrlen) &&
 		verbosity < VERB_DETAIL)
 		return 0;
+#  ifdef ENOTCONN
+	/* For 0.0.0.0, ::0 targets it can return that socket is not connected.
+	 * This can be ignored, and the address skipped. It remains
+	 * possible to send there for completeness in configuration. */
+	if(errno == ENOTCONN && addr_is_any(
+		(struct sockaddr_storage*)addr, addrlen) &&
+		verbosity < VERB_DETAIL)
+		return 0;
+#  endif
 	return 1;
 }