diff --git a/README.md b/README.md
index 44a8baa..9f09906 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ The concept behind this is to target our answers, and be stealthier on the netwo
 
 - Built-in SMB Auth server.
 	
-Supports NTLMv1, NTLMv2 hashes with Extended Security NTLMSSP by default. Successfully tested from Windows 95 to Server 2022, Samba and Mac OSX Lion. Clear text password is supported for NT4, and LM hashing downgrade when the --lm option is set. SMBv2 has also been implemented and is supported by default.
+Supports NTLMv1, NTLMv2 hashes with Extended Security NTLMSSP by default. Successfully tested from Windows 95 to Server 2022, Samba and Mac OSX Lion. Clear text password is supported for NT4, and LM hashing downgrade when the --lm option is set. If --disable-ess is set, extended session security will be disabled for NTLMv1 authentication. SMBv2 has also been implemented and is supported by default.
 
 - Built-in MSSQL Auth server.
 
@@ -163,6 +163,7 @@ Options:
                                 with -r. Default: Off
 	  --lm                  Force LM hashing downgrade for Windows XP/2003 and
 	                        earlier. Default: Off
+	  --disable-ess         Force ESS downgrade. Default: Off
 	  -v, --verbose         Increase verbosity.
 	
 
diff --git a/Responder.py b/Responder.py
index 2b62977..302bdf1 100755
--- a/Responder.py
+++ b/Responder.py
@@ -43,6 +43,7 @@ parser.add_option('-F','--ForceWpadAuth',  action="store_true", help="Force NTLM
 parser.add_option('-P','--ProxyAuth',       action="store_true", help="Force NTLM (transparently)/Basic (prompt) authentication for the proxy. WPAD doesn't need to be ON. This option is highly effective when combined with -r. Default: False", dest="ProxyAuth_On_Off", default=False)
 
 parser.add_option('--lm',                  action="store_true", help="Force LM hashing downgrade for Windows XP/2003 and earlier. Default: False", dest="LM_On_Off", default=False)
+parser.add_option('--disable-ess',         action="store_true", help="Force ESS downgrade. Default: False", dest="NOESS_On_Off", default=False)
 parser.add_option('-v','--verbose',        action="store_true", help="Increase verbosity.", dest="Verbose")
 options, args = parser.parse_args()
 
diff --git a/packets.py b/packets.py
index 77036bd..4f5acb3 100644
--- a/packets.py
+++ b/packets.py
@@ -791,7 +791,7 @@ class LDAPNTLMChallenge(Packet):
 		("NTLMSSPNtWorkstationLen",                   "\x1e\x00"),
 		("NTLMSSPNtWorkstationMaxLen",                "\x1e\x00"),
 		("NTLMSSPNtWorkstationBuffOffset",            "\x38\x00\x00\x00"),
-		("NTLMSSPNtNegotiateFlags",                   "\x15\x82\x89\xe2"),
+		("NTLMSSPNtNegotiateFlags",                   "\x15\x82\x81\xe2" if settings.Config.NOESS_On_Off else "\x15\x82\x89\xe2"),
 		("NTLMSSPNtServerChallenge",                  "\x81\x22\x33\x34\x55\x46\xe7\x88"),
 		("NTLMSSPNtReserved",                         "\x00\x00\x00\x00\x00\x00\x00\x00"),
 		("NTLMSSPNtTargetInfoLen",                    "\x94\x00"),
@@ -1331,7 +1331,7 @@ class SMBSession1Data(Packet):
 		("NTLMSSPNtWorkstationLen","\x1e\x00"),
 		("NTLMSSPNtWorkstationMaxLen","\x1e\x00"),
 		("NTLMSSPNtWorkstationBuffOffset","\x38\x00\x00\x00"),
-		("NTLMSSPNtNegotiateFlags","\x15\x82\x89\xe2"),
+		("NTLMSSPNtNegotiateFlags","\x15\x82\x81\xe2" if settings.Config.NOESS_On_Off else "\x15\x82\x89\xe2"),
 		("NTLMSSPNtServerChallenge","\x81\x22\x33\x34\x55\x46\xe7\x88"),
 		("NTLMSSPNtReserved","\x00\x00\x00\x00\x00\x00\x00\x00"),
 		("NTLMSSPNtTargetInfoLen","\x94\x00"),
@@ -1651,7 +1651,7 @@ class SMB2Session1Data(Packet):
 		("NTLMSSPNtWorkstationLen","\x1e\x00"),
 		("NTLMSSPNtWorkstationMaxLen","\x1e\x00"),
 		("NTLMSSPNtWorkstationBuffOffset","\x38\x00\x00\x00"),
-		("NTLMSSPNtNegotiateFlags","\x15\x82\x89\xe2"),
+		("NTLMSSPNtNegotiateFlags","\x15\x82\x81\xe2" if settings.Config.NOESS_On_Off else "\x15\x82\x89\xe2"),
 		("NTLMSSPNtServerChallenge","\x81\x22\x33\x34\x55\x46\xe7\x88"),
 		("NTLMSSPNtReserved","\x00\x00\x00\x00\x00\x00\x00\x00"),
 		("NTLMSSPNtTargetInfoLen","\x94\x00"),
diff --git a/settings.py b/settings.py
index b96f127..3c02527 100644
--- a/settings.py
+++ b/settings.py
@@ -176,6 +176,7 @@ class Settings:
 		# CLI options
 		self.ExternalIP         = options.ExternalIP
 		self.LM_On_Off          = options.LM_On_Off
+		self.NOESS_On_Off       = options.NOESS_On_Off
 		self.WPAD_On_Off        = options.WPAD_On_Off
 		self.Wredirect          = options.Wredirect
 		self.NBTNSDomain        = options.NBTNSDomain
diff --git a/utils.py b/utils.py
index 7a71c83..f805279 100644
--- a/utils.py
+++ b/utils.py
@@ -403,6 +403,7 @@ def StartupMessage():
 	print('    %-27s' % "Force WPAD auth" + (enabled if settings.Config.Force_WPAD_Auth else disabled))
 	print('    %-27s' % "Force Basic Auth" + (enabled if settings.Config.Basic else disabled))
 	print('    %-27s' % "Force LM downgrade" + (enabled if settings.Config.LM_On_Off == True else disabled))
+	print('    %-27s' % "Force ESS downgrade" + (enabled if settings.Config.NOESS_On_Off == True or settings.Config.LM_On_Off == True else disabled))
 	print('    %-27s' % "Fingerprint hosts" + (enabled if settings.Config.Finger_On_Off == True else disabled))
 	print('')