diff --git a/dns/dns.go b/dns/dns.go
index 03a75f4..6c6ad0a 100644
--- a/dns/dns.go
+++ b/dns/dns.go
@@ -148,7 +148,7 @@ func (ds *DNSList) lookupHostDoH(ctx context.Context, host string) (hosts []stri
 					return ErrSuccess
 				}
 			}
-			if !errors.Is(err, context.DeadlineExceeded) && !errors.Is(err, context.Canceled) {
+			if !errors.Is(err, context.Canceled) {
 				addr.disable(time.Hour) // no need to acquire write lock
 			}
 		}
@@ -195,7 +195,7 @@ func (ds *DNSList) DialContext(ctx context.Context, dialer *net.Dialer, firstFra
 			conn, err = dialer.DialContext(ctx, "tcp", addr.a)
 			if err != nil {
 				logrus.Debugln("[terasu.dns] -- dial tcp", host, addr, "err:", err)
-				if !errors.Is(err, context.DeadlineExceeded) && !errors.Is(err, context.Canceled) {
+				if !errors.Is(err, context.Canceled) {
 					addr.disable(time.Hour) // no need to acquire write lock
 				}
 				continue
@@ -230,7 +230,7 @@ func (ds *DNSList) DialContext(ctx context.Context, dialer *net.Dialer, firstFra
 			}
 			logrus.Debugln("[terasu.dns] -- hs tls", host, addr, "err:", err)
 			_ = tlsConn.Close()
-			if !errors.Is(err, context.DeadlineExceeded) && !errors.Is(err, context.Canceled) {
+			if !errors.Is(err, context.Canceled) {
 				logrus.Debugln("[terasu.dns] == disable", host, addr)
 				addr.disable(time.Hour) // no need to acquire write lock
 			}