diff --git a/quic/core/http/end_to_end_test.cc b/quic/core/http/end_to_end_test.cc
index b1b9b4f..2a0603d 100644
--- a/quic/core/http/end_to_end_test.cc
+++ b/quic/core/http/end_to_end_test.cc
@@ -5332,8 +5332,7 @@
 
 TEST_P(EndToEndPacketReorderingTest, ReorderedPathChallenge) {
   ASSERT_TRUE(Initialize());
-  if (!version_.HasIetfQuicFrames() ||
-      !client_->client()->session()->connection()->use_path_validator()) {
+  if (!version_.HasIetfQuicFrames()) {
     return;
   }
   client_.reset(EndToEndTest::CreateQuicClient(nullptr));
@@ -5393,8 +5392,7 @@
 
 TEST_P(EndToEndPacketReorderingTest, PathValidationFailure) {
   ASSERT_TRUE(Initialize());
-  if (!version_.HasIetfQuicFrames() ||
-      !client_->client()->session()->connection()->use_path_validator()) {
+  if (!version_.HasIetfQuicFrames()) {
     return;
   }
 
diff --git a/quic/core/quic_connection.cc b/quic/core/quic_connection.cc
index 99441b6..5dfff49 100644
--- a/quic/core/quic_connection.cc
+++ b/quic/core/quic_connection.cc
@@ -625,7 +625,7 @@
     QUIC_RELOADABLE_FLAG_COUNT(
         quic_remove_connection_migration_connection_option);
   }
-  if (framer_.version().HasIetfQuicFrames() && use_path_validator_ &&
+  if (framer_.version().HasIetfQuicFrames() &&
       count_bytes_on_alternative_path_separately_ &&
       GetQuicReloadableFlag(quic_server_reverse_validate_new_path3) &&
       (remove_connection_migration_connection_option ||
@@ -1751,19 +1751,8 @@
     debug_visitor_->OnPathResponseFrame(frame);
   }
   MaybeUpdateAckTimeout();
-  if (use_path_validator_) {
-    QUIC_RELOADABLE_FLAG_COUNT_N(quic_pass_path_response_to_validator, 1, 4);
     path_validator_.OnPathResponse(
         frame.data_buffer, last_received_packet_info_.destination_address);
-  } else {
-    if (!transmitted_connectivity_probe_payload_ ||
-        *transmitted_connectivity_probe_payload_ != frame.data_buffer) {
-      // Is not for the probe we sent, ignore it.
-      return true;
-    }
-    // Have received the matching PATH RESPONSE, saved payload no longer valid.
-    transmitted_connectivity_probe_payload_ = nullptr;
-  }
   return connected_;
 }
 
@@ -2248,8 +2237,6 @@
   QUICHE_DCHECK(version().HasIetfInvariantHeader());
   QUICHE_DCHECK_EQ(perspective_, Perspective::IS_CLIENT);
 
-  if (use_path_validator_) {
-    QUIC_RELOADABLE_FLAG_COUNT_N(quic_pass_path_response_to_validator, 4, 4);
     if (!IsDefaultPath(last_received_packet_info_.destination_address,
                        last_received_packet_info_.source_address)) {
       // This packet is received on a probing path. Do not close connection.
@@ -2265,12 +2252,6 @@
       }
       return;
     }
-  } else if (!visitor_->ValidateStatelessReset(
-                 last_received_packet_info_.destination_address,
-                 last_received_packet_info_.source_address)) {
-    // This packet is received on a probing path. Do not close connection.
-    return;
-  }
 
   const std::string error_details = "Received stateless reset.";
   QUIC_CODE_COUNT(quic_tear_down_local_connection_on_stateless_reset);
@@ -3537,8 +3518,7 @@
       // The write failed, but the writer is not blocked, so return true.
       return true;
     }
-    if (use_path_validator_ && !send_on_current_path) {
-      QUIC_RELOADABLE_FLAG_COUNT_N(quic_pass_path_response_to_validator, 2, 4);
+    if (!send_on_current_path) {
       // Only handle MSG_TOO_BIG as error on current path.
       return true;
     }
@@ -4602,10 +4582,8 @@
   // Cancel the alarms so they don't trigger any action now that the
   // connection is closed.
   CancelAllAlarms();
-  if (use_path_validator_) {
-    QUIC_RELOADABLE_FLAG_COUNT_N(quic_pass_path_response_to_validator, 3, 4);
     CancelPathValidation();
-  }
+
   peer_issued_cid_manager_.reset();
   self_issued_cid_manager_.reset();
 }
@@ -4997,16 +4975,12 @@
   } else {
     // IETF QUIC path challenge.
     // Send a path probe request using IETF QUIC PATH_CHALLENGE frame.
-    transmitted_connectivity_probe_payload_ =
-        std::make_unique<QuicPathFrameBuffer>();
-    random_generator_->RandBytes(transmitted_connectivity_probe_payload_.get(),
+    QuicPathFrameBuffer transmitted_connectivity_probe_payload;
+    random_generator_->RandBytes(&transmitted_connectivity_probe_payload,
                                  sizeof(QuicPathFrameBuffer));
     probing_packet =
         packet_creator_.SerializePathChallengeConnectivityProbingPacket(
-            *transmitted_connectivity_probe_payload_);
-    if (!probing_packet) {
-      transmitted_connectivity_probe_payload_ = nullptr;
-    }
+            transmitted_connectivity_probe_payload);
   }
   QUICHE_DCHECK_EQ(IsRetransmittable(*probing_packet), NO_RETRANSMITTABLE_DATA);
   return WritePacketUsingWriter(std::move(probing_packet), probing_writer,
@@ -6465,7 +6439,6 @@
 void QuicConnection::ValidatePath(
     std::unique_ptr<QuicPathValidationContext> context,
     std::unique_ptr<QuicPathValidator::ResultDelegate> result_delegate) {
-  QUICHE_DCHECK(use_path_validator_);
   if (!connection_migration_use_new_cid_ &&
       perspective_ == Perspective::IS_CLIENT &&
       !IsDefaultPath(context->self_address(), context->peer_address())) {
@@ -6582,17 +6555,14 @@
 }
 
 bool QuicConnection::HasPendingPathValidation() const {
-  QUICHE_DCHECK(use_path_validator_);
   return path_validator_.HasPendingPathValidation();
 }
 
 QuicPathValidationContext* QuicConnection::GetPathValidationContext() const {
-  QUICHE_DCHECK(use_path_validator_);
   return path_validator_.GetContext();
 }
 
 void QuicConnection::CancelPathValidation() {
-  QUICHE_DCHECK(use_path_validator_);
   path_validator_.CancelPathValidation();
 }
 
diff --git a/quic/core/quic_connection.h b/quic/core/quic_connection.h
index ebeed1c..0f7cac3 100644
--- a/quic/core/quic_connection.h
+++ b/quic/core/quic_connection.h
@@ -141,12 +141,6 @@
   // bandwidth.  Returns true if data was sent, false otherwise.
   virtual bool SendProbingData() = 0;
 
-  // Called when stateless reset packet is received. Returns true if the
-  // connection needs to be closed.
-  virtual bool ValidateStatelessReset(
-      const quic::QuicSocketAddress& self_address,
-      const quic::QuicSocketAddress& peer_address) = 0;
-
   // Called when the connection experiences a change in congestion window.
   virtual void OnCongestionWindowChange(QuicTime now) = 0;
 
@@ -1153,8 +1147,6 @@
   // Can only be set if this is a client connection.
   void EnableLegacyVersionEncapsulation(const std::string& server_name);
 
-  bool use_path_validator() const { return use_path_validator_; }
-
   // If now is close to idle timeout, returns true and sends a connectivity
   // probing packet to test the connection for liveness. Otherwise, returns
   // false.
@@ -2145,12 +2137,6 @@
   // Time this connection can release packets into the future.
   QuicTime::Delta release_time_into_future_;
 
-  // Payload of most recently transmitted IETF QUIC connectivity
-  // probe packet (the PATH_CHALLENGE payload). This implementation transmits
-  // only one PATH_CHALLENGE per connectivity probe, so only one
-  // QuicPathFrameBuffer is needed.
-  std::unique_ptr<QuicPathFrameBuffer> transmitted_connectivity_probe_payload_;
-
   // Payloads that were received in the most recent probe. This needs to be a
   // Deque because the peer might no be using this implementation, and others
   // might send a packet with more than one PATH_CHALLENGE, so all need to be
@@ -2209,9 +2195,6 @@
   size_t anti_amplification_factor_ =
       GetQuicFlag(FLAGS_quic_anti_amplification_factor);
 
-  bool use_path_validator_ =
-      GetQuicReloadableFlag(quic_pass_path_response_to_validator);
-
   // True if AckFrequencyFrame is supported.
   bool can_receive_ack_frequency_frame_ = false;
 
diff --git a/quic/core/quic_connection_test.cc b/quic/core/quic_connection_test.cc
index 86da486..2716e00 100644
--- a/quic/core/quic_connection_test.cc
+++ b/quic/core/quic_connection_test.cc
@@ -2499,7 +2499,6 @@
   EXPECT_EQ(kPeerAddress, connection_.peer_address());
   EXPECT_EQ(kPeerAddress, connection_.effective_peer_address());
   if (GetParam().version.HasIetfQuicFrames() &&
-      connection_.use_path_validator() &&
       GetQuicReloadableFlag(quic_count_bytes_on_alternative_path_seperately)) {
     QuicByteCount bytes_sent =
         QuicConnectionPeer::BytesSentOnAlternativePath(&connection_);
@@ -6955,9 +6954,6 @@
                                                 kTestStatelessResetToken));
   std::unique_ptr<QuicReceivedPacket> received(
       ConstructReceivedPacket(*packet, QuicTime::Zero()));
-  if (!connection_.use_path_validator()) {
-    EXPECT_CALL(visitor_, ValidateStatelessReset(_, _)).WillOnce(Return(true));
-  }
   EXPECT_CALL(visitor_, OnConnectionClosed(_, ConnectionCloseSource::FROM_PEER))
       .WillOnce(Invoke(this, &QuicConnectionTest::SaveConnectionCloseFrame));
   connection_.ProcessUdpPacket(kSelfAddress, kPeerAddress, *received);
@@ -8894,8 +8890,7 @@
 }
 
 TEST_P(QuicConnectionTest, ClientResponseToPathChallengeOnAlternativeSocket) {
-  if (!VersionHasIetfQuicFrames(connection_.version().transport_version) ||
-      !connection_.use_path_validator()) {
+  if (!VersionHasIetfQuicFrames(connection_.version().transport_version)) {
     return;
   }
   PathProbeTestInit(Perspective::IS_CLIENT);
@@ -11891,8 +11886,7 @@
 }
 
 TEST_P(QuicConnectionTest, PathValidationOnNewSocketSuccess) {
-  if (!VersionHasIetfQuicFrames(connection_.version().transport_version) ||
-      !connection_.use_path_validator()) {
+  if (!VersionHasIetfQuicFrames(connection_.version().transport_version)) {
     return;
   }
   PathProbeTestInit(Perspective::IS_CLIENT);
@@ -11925,8 +11919,7 @@
 }
 
 TEST_P(QuicConnectionTest, NewPathValidationCancelsPreviousOne) {
-  if (!VersionHasIetfQuicFrames(connection_.version().transport_version) ||
-      !connection_.use_path_validator()) {
+  if (!VersionHasIetfQuicFrames(connection_.version().transport_version)) {
     return;
   }
   PathProbeTestInit(Perspective::IS_CLIENT);
@@ -11984,8 +11977,7 @@
 
 // Regression test for b/182571515.
 TEST_P(QuicConnectionTest, PathValidationRetry) {
-  if (!VersionHasIetfQuicFrames(connection_.version().transport_version) ||
-      !connection_.use_path_validator()) {
+  if (!VersionHasIetfQuicFrames(connection_.version().transport_version)) {
     return;
   }
   PathProbeTestInit(Perspective::IS_CLIENT);
@@ -12017,8 +12009,7 @@
 }
 
 TEST_P(QuicConnectionTest, PathValidationReceivesStatelessReset) {
-  if (!VersionHasIetfQuicFrames(connection_.version().transport_version) ||
-      !connection_.use_path_validator()) {
+  if (!VersionHasIetfQuicFrames(connection_.version().transport_version)) {
     return;
   }
   PathProbeTestInit(Perspective::IS_CLIENT);
@@ -12104,8 +12095,7 @@
 //  Tests that PATH_CHALLENGE is dropped if it is sent via the default writer
 //  and the writer is blocked.
 TEST_P(QuicConnectionTest, SendPathChallengeUsingBlockedDefaultSocket) {
-  if (!VersionHasIetfQuicFrames(connection_.version().transport_version) ||
-      !connection_.use_path_validator()) {
+  if (!VersionHasIetfQuicFrames(connection_.version().transport_version)) {
     return;
   }
   PathProbeTestInit(Perspective::IS_SERVER);
@@ -12178,8 +12168,7 @@
 
 // Tests that write error on the alternate socket should be ignored.
 TEST_P(QuicConnectionTest, SendPathChallengeFailOnNewSocket) {
-  if (!VersionHasIetfQuicFrames(connection_.version().transport_version) ||
-      !connection_.use_path_validator()) {
+  if (!VersionHasIetfQuicFrames(connection_.version().transport_version)) {
     return;
   }
   PathProbeTestInit(Perspective::IS_CLIENT);
@@ -12210,8 +12199,7 @@
 // Tests that write error while sending PATH_CHALLANGE from the default socket
 // should close the connection.
 TEST_P(QuicConnectionTest, SendPathChallengeFailOnDefaultPath) {
-  if (!VersionHasIetfQuicFrames(connection_.version().transport_version) ||
-      !connection_.use_path_validator()) {
+  if (!VersionHasIetfQuicFrames(connection_.version().transport_version)) {
     return;
   }
   PathProbeTestInit(Perspective::IS_CLIENT);
@@ -12245,8 +12233,7 @@
 }
 
 TEST_P(QuicConnectionTest, SendPathChallengeFailOnAlternativePeerAddress) {
-  if (!VersionHasIetfQuicFrames(connection_.version().transport_version) ||
-      !connection_.use_path_validator()) {
+  if (!VersionHasIetfQuicFrames(connection_.version().transport_version)) {
     return;
   }
   PathProbeTestInit(Perspective::IS_CLIENT);
@@ -12277,8 +12264,7 @@
 
 TEST_P(QuicConnectionTest,
        SendPathChallengeFailPacketTooBigOnAlternativePeerAddress) {
-  if (!VersionHasIetfQuicFrames(connection_.version().transport_version) ||
-      !connection_.use_path_validator()) {
+  if (!VersionHasIetfQuicFrames(connection_.version().transport_version)) {
     return;
   }
   PathProbeTestInit(Perspective::IS_CLIENT);
@@ -13471,8 +13457,7 @@
 }
 
 TEST_P(QuicConnectionTest, MigrateToNewPathDuringProbing) {
-  if (!VersionHasIetfQuicFrames(connection_.version().transport_version) ||
-      !connection_.use_path_validator()) {
+  if (!VersionHasIetfQuicFrames(connection_.version().transport_version)) {
     return;
   }
   PathProbeTestInit(Perspective::IS_CLIENT);
@@ -14473,7 +14458,7 @@
 TEST_P(
     QuicConnectionTest,
     ReplacePeerIssuedConnectionIdOnBothPathsTriggeredByNewConnectionIdFrame) {
-  if (!version().HasIetfQuicFrames() || !connection_.use_path_validator() ||
+  if (!version().HasIetfQuicFrames() ||
       !connection_.count_bytes_on_alternative_path_separately()) {
     return;
   }
diff --git a/quic/core/quic_flags_list.h b/quic/core/quic_flags_list.h
index 90def64..cb521fc 100644
--- a/quic/core/quic_flags_list.h
+++ b/quic/core/quic_flags_list.h
@@ -73,8 +73,6 @@
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_ignore_max_push_id, true)
 // If true, include stream information in idle timeout connection close detail.
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_add_stream_info_to_idle_close_detail, true)
-// If true, pass the received PATH_RESPONSE payload to path validator to move forward the path validation.
-QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_pass_path_response_to_validator, true)
 // If true, quic server will send ENABLE_CONNECT_PROTOCOL setting and and endpoint will validate required request/response headers and extended CONNECT mechanism and update code counts of valid/invalid headers.
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_verify_request_headers_2, true)
 // If true, record addresses that server has sent reset to recently, and do not send reset if the address lives in the set.
diff --git a/quic/core/quic_session.h b/quic/core/quic_session.h
index b8f175e..dd1fa42 100644
--- a/quic/core/quic_session.h
+++ b/quic/core/quic_session.h
@@ -139,11 +139,6 @@
                         bool is_connectivity_probe) override;
   void OnCanWrite() override;
   bool SendProbingData() override;
-  bool ValidateStatelessReset(
-      const quic::QuicSocketAddress& /*self_address*/,
-      const quic::QuicSocketAddress& /*peer_address*/) override {
-    return true;
-  }
   void OnCongestionWindowChange(QuicTime /*now*/) override {}
   void OnConnectionMigration(AddressChangeType /*type*/) override {}
   // Adds a connection level WINDOW_UPDATE frame.
diff --git a/quic/test_tools/quic_test_utils.h b/quic/test_tools/quic_test_utils.h
index 82262eb..ddbc9b9 100644
--- a/quic/test_tools/quic_test_utils.h
+++ b/quic/test_tools/quic_test_utils.h
@@ -454,9 +454,6 @@
   MOCK_METHOD(void, OnWriteBlocked, (), (override));
   MOCK_METHOD(void, OnCanWrite, (), (override));
   MOCK_METHOD(bool, SendProbingData, (), (override));
-  MOCK_METHOD(bool, ValidateStatelessReset,
-              (const quic::QuicSocketAddress&, const quic::QuicSocketAddress&),
-              (override));
   MOCK_METHOD(void, OnCongestionWindowChange, (QuicTime now), (override));
   MOCK_METHOD(void, OnConnectionMigration, (AddressChangeType type),
               (override));
diff --git a/quic/test_tools/simulator/quic_endpoint.h b/quic/test_tools/simulator/quic_endpoint.h
index 7fc4d87..136410f 100644
--- a/quic/test_tools/simulator/quic_endpoint.h
+++ b/quic/test_tools/simulator/quic_endpoint.h
@@ -51,11 +51,6 @@
   void OnCryptoFrame(const QuicCryptoFrame& frame) override;
   void OnCanWrite() override;
   bool SendProbingData() override;
-  bool ValidateStatelessReset(
-      const quic::QuicSocketAddress& /*self_address*/,
-      const quic::QuicSocketAddress& /*peer_address*/) override {
-    return true;
-  }
   bool WillingAndAbleToWrite() const override;
   bool ShouldKeepConnectionAlive() const override;
 
diff --git a/quic/tools/quic_client_base.cc b/quic/tools/quic_client_base.cc
index e11e25b..e26f08c 100644
--- a/quic/tools/quic_client_base.cc
+++ b/quic/tools/quic_client_base.cc
@@ -289,8 +289,7 @@
 
 bool QuicClientBase::ValidateAndMigrateSocket(const QuicIpAddress& new_host) {
   QUICHE_DCHECK(VersionHasIetfQuicFrames(
-                    session_->connection()->version().transport_version) &&
-                session_->connection()->use_path_validator());
+      session_->connection()->version().transport_version));
   if (!connected()) {
     return false;
   }