diff --git a/impacket/krb5/kerberosv5.py b/impacket/krb5/kerberosv5.py
index 7c66a93d87..5308b4b28a 100644
--- a/impacket/krb5/kerberosv5.py
+++ b/impacket/krb5/kerberosv5.py
@@ -699,7 +699,7 @@ def getErrorPacket( self ):
         return self.packet
 
     def getErrorString( self ):
-        return constants.ERROR_MESSAGES[self.error]
+        return str(self)
 
     def __str__( self ):
         retString = 'Kerberos SessionError: %s(%s)' % (constants.ERROR_MESSAGES[self.error])
@@ -708,7 +708,13 @@ def __str__( self ):
             if self.error == constants.ErrorCodes.KRB_ERR_GENERIC.value:
                 eData = decoder.decode(self.packet['e-data'], asn1Spec = KERB_ERROR_DATA())[0]
                 nt_error = struct.unpack('<L', eData['data-value'].asOctets()[:4])[0]
-                retString += '\nNT ERROR: %s(%s)' % (nt_errors.ERROR_MESSAGES[nt_error])
+
+                if nt_error in nt_errors.ERROR_MESSAGES:
+                    error_msg_short = nt_errors.ERROR_MESSAGES[nt_error][0] 
+                    error_msg_verbose = nt_errors.ERROR_MESSAGES[nt_error][1] 
+                    retString += '\nNT ERROR: code: 0x%x - %s - %s' % (nt_error, error_msg_short, error_msg_verbose)
+                else:
+                    retString += '\nNT ERROR: unknown error code: 0x%x' % nt_error
         except:
             pass
 
diff --git a/impacket/smb.py b/impacket/smb.py
index fd3b1b1a2d..5950348761 100644
--- a/impacket/smb.py
+++ b/impacket/smb.py
@@ -578,7 +578,13 @@ def __str__( self ):
                 error_code_str = '%s(%s)' % error_code
 
         if self.nt_status:
-            return 'SMB SessionError: %s(%s)' % nt_errors.ERROR_MESSAGES[self.error_code]
+            key = self.error_code
+            if key in nt_errors.ERROR_MESSAGES:
+                error_msg_short = nt_errors.ERROR_MESSAGES[key][0] 
+                error_msg_verbose = nt_errors.ERROR_MESSAGES[key][1] 
+                return 'SMB SessionError: code: 0x%x - %s - %s' % (self.error_code, error_msg_short, error_msg_verbose)
+            else:
+                return 'SMB SessionError: unknown error code: 0x%x' % self.error_code
         else:
             # Fall back to the old format
             return 'SMB SessionError: class: %s, code: %s' % (error_class_str, error_code_str)
diff --git a/impacket/smbconnection.py b/impacket/smbconnection.py
index a4e0fe72fa..eb211a78d1 100644
--- a/impacket/smbconnection.py
+++ b/impacket/smbconnection.py
@@ -986,10 +986,13 @@ def getErrorPacket( self ):
         return self.packet
 
     def getErrorString( self ):
-        return nt_errors.ERROR_MESSAGES[self.error]
+        return str(self)
 
     def __str__( self ):
-        if self.error in nt_errors.ERROR_MESSAGES:
-            return 'SMB SessionError: %s(%s)' % (nt_errors.ERROR_MESSAGES[self.error])
+        key = self.error
+        if key in nt_errors.ERROR_MESSAGES:
+            error_msg_short = nt_errors.ERROR_MESSAGES[key][0] 
+            error_msg_verbose = nt_errors.ERROR_MESSAGES[key][1] 
+            return 'SMB SessionError: code: 0x%x - %s - %s' % (self.error, error_msg_short, error_msg_verbose)
         else:
-            return 'SMB SessionError: 0x%x' % self.error
+            return 'SMB SessionError: unknown error code: 0x%x' % self.error