diff --git a/in_session.go b/in_session.go
index 6edbb8409..5445967cd 100644
--- a/in_session.go
+++ b/in_session.go
@@ -87,7 +87,7 @@ func (state inSession) Timeout(session *session, event internal.Event) (nextStat
 }
 
 func (state inSession) handleLogout(session *session, msg *Message) (nextState sessionState) {
-	if err := session.verifySelect(msg, false, false); err != nil {
+	if err := session.verifySelect(msg, false, false, true); err != nil {
 		return state.processReject(session, msg, err)
 	}
 
@@ -154,7 +154,7 @@ func (state inSession) handleSequenceReset(session *session, msg *Message) (next
 		}
 	}
 
-	if err := session.verifySelect(msg, bool(gapFillFlag), bool(gapFillFlag)); err != nil {
+	if err := session.verifySelect(msg, bool(gapFillFlag), bool(gapFillFlag), true); err != nil {
 		return state.processReject(session, msg, err)
 	}
 
diff --git a/logon_state_test.go b/logon_state_test.go
index ee47a2be6..f5c871ea6 100644
--- a/logon_state_test.go
+++ b/logon_state_test.go
@@ -226,6 +226,27 @@ func (s *LogonStateTestSuite) TestFixMsgInLogonInitiateLogonExpectResetSeqNum()
 	s.NextSenderMsgSeqNum(2)
 }
 
+func (s *LogonStateTestSuite) TestFixMsgInLogonInitiateLogonRejectedSeqNumNotReset() {
+	s.session.InitiateLogon = true
+	s.session.sentReset = true
+	s.Require().Nil(s.store.IncrNextSenderMsgSeqNum())
+
+	logon := s.Logon()
+	logon.Body.SetField(tagHeartBtInt, FIXInt(32))
+	logon.Body.SetField(tagResetSeqNumFlag, FIXBoolean(true))
+
+	s.MockApp.On("FromAdmin").Return(RejectLogon{"reject message"})
+	s.MockApp.On("OnLogout")
+	s.MockApp.On("ToAdmin")
+	s.fixMsgIn(s.session, logon)
+
+	s.MockApp.AssertExpectations(s.T())
+	s.State(latentState{})
+
+	s.NextTargetMsgSeqNum(2)
+	s.NextSenderMsgSeqNum(3)
+}
+
 func (s *LogonStateTestSuite) TestFixMsgInLogonInitiateLogonUnExpectedResetSeqNum() {
 	s.session.InitiateLogon = true
 	s.session.sentReset = false
@@ -358,6 +379,7 @@ func (s *LogonStateTestSuite) TestFixMsgInLogonSeqNumTooLow() {
 	logon.Body.SetField(tagHeartBtInt, FIXInt(32))
 	logon.Header.SetInt(tagMsgSeqNum, 1)
 
+	s.MockApp.On("FromAdmin").Return(nil)
 	s.MockApp.On("ToAdmin")
 	s.NextTargetMsgSeqNum(2)
 	s.fixMsgIn(s.session, logon)
diff --git a/session.go b/session.go
index 5320f49b9..cdcb8603d 100644
--- a/session.go
+++ b/session.go
@@ -507,6 +507,13 @@ func (s *session) handleLogon(msg *Message) error {
 		}
 	}
 
+	nextSenderMsgNumAtLogonReceived := s.store.NextSenderMsgSeqNum()
+
+	// Make sure this is a valid session before resetting the store.
+	if err := s.verifyMsgAgainstAppImpl(msg); err != nil {
+		return err
+	}
+
 	var resetSeqNumFlag FIXBoolean
 	if err := msg.Body.GetField(tagResetSeqNumFlag, &resetSeqNumFlag); err == nil {
 		if resetSeqNumFlag {
@@ -517,14 +524,14 @@ func (s *session) handleLogon(msg *Message) error {
 		}
 	}
 
-	nextSenderMsgNumAtLogonReceived := s.store.NextSenderMsgSeqNum()
-
 	if resetStore {
 		if err := s.store.Reset(); err != nil {
 			return err
 		}
 	}
 
+	// Verify seq num too high but dont check against app implementation since we just did that.
+	// Don't need to double check.
 	if err := s.verifyIgnoreSeqNumTooHigh(msg); err != nil {
 		return err
 	}
@@ -586,18 +593,18 @@ func (s *session) initiateLogoutInReplyTo(reason string, inReplyTo *Message) (er
 }
 
 func (s *session) verify(msg *Message) MessageRejectError {
-	return s.verifySelect(msg, true, true)
+	return s.verifySelect(msg, true, true, true)
 }
 
 func (s *session) verifyIgnoreSeqNumTooHigh(msg *Message) MessageRejectError {
-	return s.verifySelect(msg, false, true)
+	return s.verifySelect(msg, false, true, false)
 }
 
 func (s *session) verifyIgnoreSeqNumTooHighOrLow(msg *Message) MessageRejectError {
-	return s.verifySelect(msg, false, false)
+	return s.verifySelect(msg, false, false, true)
 }
 
-func (s *session) verifySelect(msg *Message, checkTooHigh bool, checkTooLow bool) MessageRejectError {
+func (s *session) verifySelect(msg *Message, checkTooHigh bool, checkTooLow bool, checkAppImpl bool) MessageRejectError {
 	if reject := s.checkBeginString(msg); reject != nil {
 		return reject
 	}
@@ -626,6 +633,14 @@ func (s *session) verifySelect(msg *Message, checkTooHigh bool, checkTooLow bool
 		}
 	}
 
+	if checkAppImpl {
+		return s.verifyMsgAgainstAppImpl(msg)
+	}
+
+	return nil
+}
+
+func (s *session) verifyMsgAgainstAppImpl(msg *Message) MessageRejectError {
 	if s.Validator != nil {
 		if reject := s.Validator.Validate(msg); reject != nil {
 			return reject