diff --git a/dns/client.go b/dns/client.go
index a8b4ecd..7687c99 100644
--- a/dns/client.go
+++ b/dns/client.go
@@ -117,17 +117,17 @@ func (c *Client) exchange(qname string, reqBytes []byte, preferTCP bool) (server
 	servers := c.GetServers(qname)
 	for _, server = range servers {
 		rc, err = dialer.Dial(network, server)
-		// TODO: support timeout setting for different upstream server
-		if len(servers) > 1 {
-			rc.SetDeadline(time.Now().Add(time.Duration(3) * time.Second))
-		}
-
 		if err != nil {
 			log.F("[dns] failed to connect to server %v: %v", server, err)
 			continue
 		}
 		defer rc.Close()
 
+		// TODO: support timeout setting for different upstream server
+		if len(servers) > 1 {
+			rc.SetDeadline(time.Now().Add(time.Duration(3) * time.Second))
+		}
+
 		switch network {
 		case "tcp":
 			respBytes, err = c.exchangeTCP(rc, reqBytes)