diff --git a/netwatch-dns.rsc b/netwatch-dns.rsc
index 9531d4ad..7c6a7b5b 100644
--- a/netwatch-dns.rsc
+++ b/netwatch-dns.rsc
@@ -115,13 +115,15 @@
 
     :local Data false;
     :onerror Err {
+      :local I 1;
       :retry {
+        :set I ($I ^ 1);
         :set Data ([ /tool/fetch check-certificate=yes-without-crl output=user \
           http-header-field=({ "accept: application/dns-message" }) \
           url=(($DohServer->"doh-url") . "?dns=" . [ :convert to=base64 ([ :rndstr length=2 ] . \
-          "\01\00" . "\00\01" . "\00\00" . "\00\00" . "\00\00" . "\09doh-check\05eworm\02de\00" . \
-          "\00\10" . "\00\01") ]) as-value ]->"data");
-      } delay=1s max=3;
+          "\01\00" . "\00\01" . "\00\00" . "\00\00" . "\00\00" . "\09doh-check\05eworm" . \
+          ({ "\02de"; "\03net" }->$I) . "\00" . "\00\10" . "\00\01") ]) as-value ]->"data");
+      } delay=500ms max=6;
     } do={
       $LogPrint warning $ScriptName ("Request to DoH server " . ($DohServer->"doh-url") . \
           " failed: " . $Err);