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ndb/dns: ignore refused (5) error replies

--- a/sys/src/cmd/ndb/dnresolve.c

+++ b/sys/src/cmd/ndb/dnresolve.c

@@ -1153,11 +1153,12 @@

 		stats.negans++;

 	/* ignore any error replies */

-	if((mp->flags & Rmask) == Rserver){

+	switch(mp->flags & Rmask){

+	case Rrefused:

+	case Rserver:

 		stats.negserver++;

 		freeanswers(mp);

-		if(p != nil)

-			p->code = Rserver;

+		p->code = Rserver;

 		return Answerr;

 	}

-- 

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