From fc422563a35890261e785cffb623249dab476838 Mon Sep 17 00:00:00 2001
From: Shreyas Zare <shreyas@technitium.com>
Date: Sun, 6 Mar 2022 16:09:40 +0530
Subject: [PATCH] DnsServer: updated DnssecValidation property to clear cache
 when switching on DNSSEC validation to remove all unvalidated cached records.

---
 DnsServerCore/Dns/DnsServer.cs | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/DnsServerCore/Dns/DnsServer.cs b/DnsServerCore/Dns/DnsServer.cs
index 3193e61b..6a5e61bf 100644
--- a/DnsServerCore/Dns/DnsServer.cs
+++ b/DnsServerCore/Dns/DnsServer.cs
@@ -3451,7 +3451,16 @@ namespace DnsServerCore.Dns
         public bool DnssecValidation
         {
             get { return _dnssecValidation; }
-            set { _dnssecValidation = value; }
+            set
+            {
+                if (_dnssecValidation != value)
+                {
+                    if (!_dnssecValidation)
+                        _cacheZoneManager.Flush(); //flush cache to remove non validated data
+
+                    _dnssecValidation = value;
+                }
+            }
         }
 
         public int QpmLimitRequests